KC-135 Stratotanker
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The Boeing KC-135 Stratotanker is an American military aerial refueling aircraft that was developed from the
Boeing 367-80 The Boeing 367-80, known simply as the Dash 80, is an American quadjet prototype aircraft built by Boeing to demonstrate the advantages of jet propulsion for commercial aviation. It served as basis for the design of the KC-135 tanker and the 70 ...
prototype, alongside the Boeing 707 airliner. It is the predominant variant of the
C-135 Stratolifter The Boeing C-135 Stratolifter is a transport aircraft derived from the prototype Boeing 367-80 jet airliner (also the basis for the 707) in the early 1950s. It has a narrower fuselage and is shorter than the 707. Boeing gave the aircraft the ...
family of transport aircraft. The KC-135 was the
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal ...
's first jet-powered refueling tanker and replaced the
KC-97 Stratofreighter The Boeing KC-97 Stratofreighter is a four-engined, piston-powered United States strategic tanker aircraft based on the Boeing C-97 Stratofreighter. It replaced the KB-29 and was succeeded by the Boeing KC-135 Stratotanker. Design and developm ...
. The KC-135 was initially tasked with refueling strategic bombers, but it was used extensively in the
Vietnam War The Vietnam War (also known by #Names, other names) was a conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vie ...
and later conflicts such as
Operation Desert Storm Operation or Operations may refer to: Arts, entertainment and media * ''Operation'' (game), a battery-operated board game that challenges dexterity * Operation (music), a term used in musical set theory * ''Operations'' (magazine), Multi-Man ...
to extend the range and endurance of US tactical fighters and bombers. The KC-135 entered service with the United States Air Force (USAF) in 1957; it is one of nine military fixed-wing aircraft with over 60 years of continuous service with its original operator. The KC-135 is supplemented by the larger
McDonnell Douglas KC-10 Extender The McDonnell Douglas KC-10 Extender is an American aerial refueling tanker aircraft operated by the United States Air Force (USAF). A military version of the three-engine DC-10 airliner, the KC-10 was developed from the Advanced Tanker Cargo A ...
. Studies have concluded that many of the aircraft could be flown until 2030, although maintenance costs have greatly increased. The KC-135 is to be partially replaced by the
Boeing KC-46 Pegasus The Boeing KC-46 Pegasus is an American military aerial refueling and strategic military transport aircraft developed by Boeing from its Boeing 767, 767 jet airliner. In February 2011, the tanker was selected by the United States Air Force (US ...
.


Development


Background

Starting in 1950 the Air Force operated the world's first production aerial tanker, the Boeing
KC-97 Stratofreighter The Boeing KC-97 Stratofreighter is a four-engined, piston-powered United States strategic tanker aircraft based on the Boeing C-97 Stratofreighter. It replaced the KB-29 and was succeeded by the Boeing KC-135 Stratotanker. Design and developm ...
, a gasoline fueled piston-engined
Boeing Stratocruiser The Boeing 377 Stratocruiser was a large long-range airliner developed from the C-97 Stratofreighter military transport, itself a derivative of the B-29 Superfortress. The Stratocruiser's first flight was on July 8, 1947. Its design was advanced ...
(USAF designation
C-97 Stratofreighter The Boeing C-97 Stratofreighter was a long-range heavy military cargo aircraft developed from the B-29 and B-50 bombers. Design work began in 1942, the first of three prototype XC-97s flew on 9 November 1944 (none saw combat), and the first of s ...
) with a Boeing-developed flying boom and extra kerosene (jet fuel) tanks feeding the boom. The Stratocruiser airliner itself was developed from the B-29 bomber after
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
. In the KC-97, the mixed gasoline/kerosene fuel system was clearly not desirable and it was obvious that a jet-powered tanker aircraft would be the next development, having a single type of fuel for both its own engines and for passing to receiver aircraft. The 230 mph (370 km/h) cruise speed of the slower, piston-engined KC-97 was also a serious issue, as using it as an aerial tanker forced the newer jet-powered military aircraft to slow down to mate with the tanker's boom. Like its sibling, the commercial Boeing 707
jet airliner A jet airliner or jetliner is an airliner powered by jet engines (passenger jet aircraft). Airliners usually have two or four jet engines; three-engined designs were popular in the 1970s but are less common today. Airliners are commonly clas ...
, the KC-135 was derived from the
Boeing 367-80 The Boeing 367-80, known simply as the Dash 80, is an American quadjet prototype aircraft built by Boeing to demonstrate the advantages of jet propulsion for commercial aviation. It served as basis for the design of the KC-135 tanker and the 70 ...
jet transport "proof of concept" demonstrator, which was commonly called the "Dash-80". The KC-135 is similar in appearance to the 707, but has a narrower
fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...
and is shorter than the 707. The KC-135 predates the 707, and is structurally quite different from the civilian airliner. Boeing gave the future KC-135 tanker the initial designation Model 717. In 1954
USAF The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
's
Strategic Air Command Strategic Air Command (SAC) was both a United States Department of Defense Specified Command and a United States Air Force (USAF) Major Command responsible for command and control of the strategic bomber and intercontinental ballistic missile ...
(SAC) held a competition for a jet-powered aerial refueling tanker. Lockheed's tanker version of the proposed Lockheed L-193 airliner with rear fuselage-mounted engines was declared the winner in 1955. Since Boeing's proposal was already flying, the KC-135 could be delivered two years earlier and Air Force Secretary
Harold E. Talbott Harold Elstner Talbott, Jr. (March 31, 1888 – March 2, 1957) was the third United States Secretary of the Air Force. Biography He was born in Dayton, Ohio, in March 1888 and died in 1957. He attended The Hill School in Pottstown, Pennsylvania, ...
ordered 250 KC-135 tankers until Lockheed's design could be manufactured. In the end, orders for the Lockheed tanker were dropped rather than supporting two tanker designs. Lockheed never produced its jet airliner, while Boeing would eventually dominate the market with a family of airliners based on the 707. In 1954, the Air Force placed an initial order for 29 KC-135As, the first of an eventual 820 of all variants of the basic C-135 family. The first aircraft flew in August 1956 and the initial production Stratotanker was delivered to
Castle Air Force Base Castle Air Force Base (Castle AFB, 1941–1995) is a former United States Air Force Strategic Air Command base in California, located northeast of Atwater, northwest of Merced, and about south of Sacramento. The Central Valley base in u ...
,
California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
, in June 1957. The last KC-135 was delivered to the Air Force in 1965. Developed in the early 1950s, the basic airframe is characterized by 35-degree aft swept wings and
tail The tail is the section at the rear end of certain kinds of animals’ bodies; in general, the term refers to a distinct, flexible appendage to the torso. It is the part of the body that corresponds roughly to the sacrum and coccyx in mammal ...
, four underwing-mounted engine pods, a
horizontal stabilizer A tailplane, also known as a horizontal stabiliser, is a small lifting surface located on the tail (empennage) behind the main lifting surfaces of a fixed-wing aircraft as well as other non-fixed-wing aircraft such as helicopters and gyroplan ...
mounted on the fuselage near the bottom of the
vertical stabilizer A vertical stabilizer or tail fin is the static part of the vertical tail of an aircraft. The term is commonly applied to the assembly of both this fixed surface and one or more movable rudders hinged to it. Their role is to provide control, s ...
with positive dihedral on the two horizontal planes and a hi-frequency radio antenna which protrudes forward from the top of the vertical fin or stabilizer. These basic features make it strongly resemble the commercial Boeing 707 and 720 aircraft, although it is actually a different aircraft.
Reconnaissance In military operations, reconnaissance or scouting is the exploration of an area by military forces to obtain information about enemy forces, terrain, and other activities. Examples of reconnaissance include patrolling by troops (skirmisher ...
and command post variants of the aircraft, including the
RC-135 Rivet Joint The Boeing RC-135 is a family of large reconnaissance aircraft built by Boeing and modified by a number of companies, including General Dynamics, Lockheed, LTV, E-Systems, and L3 Technologies, and used by the United States Air Force and Royal ...
and EC-135 Looking Glass aircraft were operated by SAC from 1963 through 1992, when they were reassigned to the
Air Combat Command Air Combat Command (ACC) is one of nine Major Commands (MAJCOMs) in the United States Air Force, reporting to Headquarters, United States Air Force (HAF) at the Pentagon. It is the primary provider of air combat forces for the Air Force, and i ...
(ACC). The USAF EC-135 Looking Glass was subsequently replaced in its role by the
U.S. Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage o ...
E-6 Mercury The Boeing E-6 Mercury (formerly Hermes) is an airborne command post and communications relay based on the Boeing 707. The original E-6A manufactured by Boeing's defense division entered service with the United States Navy in July 1989, repla ...
aircraft, a new build airframe based on the Boeing 707-320B.


Engine retrofits

All KC-135s were originally equipped with Pratt & Whitney J57-P-59W
turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, an ...
engines, which produced of thrust dry, and approximately of thrust wet. Wet thrust is achieved through the use of water injection on takeoff, as opposed to "wet thrust" when used to describe an afterburning engine. of water are injected into the engines over the course of three minutes. The water is injected into the inlet and the diffuser case in front of the combustion case. The water cools the air in the engine to increase its density; it also reduces the turbine gas temperature, which is a primary limitation on many jet engines. This allows the use of more fuel for proper combustion and creates more thrust for short periods of time, similar in concept to "
War Emergency Power War emergency power (WEP) is a throttle setting that was present on some American World War II military aircraft engines. For use in emergency situations, it produced more than 100% of the engine's normal rated power for a limited amount of time ...
" in a piston-engined aircraft. In the 1980s, the first modification program retrofitted 157 Air Force Reserve (AFRES) and Air National Guard (ANG) tankers with the Pratt & Whitney TF33-PW-102
turbofan The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the ''turbo'' portion refers to a gas turbine engine which ac ...
engines from 707 airliners retired in the late 1970s and early 1980s. The modified tanker, designated the KC-135E, was 14% more fuel-efficient than the KC-135A and could offload 20% more fuel on long-duration flights. Only the KC-135E aircraft were equipped with
thrust reversers Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to ...
for aborted takeoffs and shorter landing roll-outs. The KC-135E fleet has since either been retrofitted as the R-model configuration or placed into long-term storage ("XJ"), as Congress has prevented the Air Force from formally retiring them. The final KC-135E, tail number ''56-3630'', was delivered by the 101st Air Refueling Wing to the 309th Aerospace Maintenance and Regeneration Group (AMARG) at
Davis–Monthan Air Force Base Davis–Monthan Air Force Base (DM AFB) is a United States Air Force base southeast of downtown Tucson, Arizona. It was established in 1925 as Davis–Monthan Landing Field. The host unit for Davis–Monthan AFB is the 355th Wing (355 WG) assi ...
in September 2009. The second modification program retrofitted 500 aircraft with new
CFM International CFM International is a 50/50 Franco-American joint venture between GE Aviation and Safran Aircraft Engines (formerly known as Snecma). It was formed to build and support the CFM56 series of turbofan engines. The company is the world’s lead ...
CFM56 The CFM International CFM56 (U.S. military designation F108) series is a Franco-American family of high-bypass turbofan aircraft engines made by CFM International (CFMI), with a thrust range of . CFMI is a 50–50 joint-owned company of Safran ...
(military designation: F108) high-bypass turbofan engines produced by
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and Safran. The CFM56 engine produces approximately of thrust, nearly a 100% increase compared to the original J57 engine. The modified tanker, designated KC-135R (modified KC-135A or E) or KC-135T (modified KC-135Q), can offload up to 50% more fuel (on a long-duration sortie), is 25% more fuel-efficient, and costs 25% less to operate than with the previous engines. It is also significantly quieter than the KC-135A, with noise levels at takeoff reduced from 126 to 99
decibel The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a po ...
s. The KC-135R's operational range is 60% greater than the KC-135E for comparable fuel offloads, providing a wider range of basing options. Upgrading the remaining KC-135Es into KC-135Rs is no longer in consideration; this would have cost approximately US$3 billion, $24 million per aircraft. According to Air Force data, the KC-135 fleet had a total operation and support cost in fiscal year 2001 of about $2.2 billion. The older E model aircraft averaged total costs of about $4.6 million per aircraft, while the R models averaged about $3.7 million per aircraft. Those costs include personnel, fuel, maintenance, modifications, and spare parts.


Avionics upgrades

In order to expand the KC-135's capabilities and improve its reliability, the aircraft has undergone a number of avionics upgrades. Among these was the Pacer-CRAG program (compass, radar and GPS) which ran from 1999 to 2002 and modified all the aircraft in the inventory to eliminate the Navigator position from the flight crew. The fuel management system was also replaced. The program development was done by
Rockwell Collins Rockwell Collins was a multinational corporation headquartered in Cedar Rapids, Iowa, providing avionics and information technology systems and services to government agencies and aircraft manufacturers. It was formed when the Collins Radio Comp ...
in
Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...
and installation was performed by BAE Systems at the
Mojave Airport The Mojave Air and Space Port at Rutan Field is in Mojave, California, United States, at an elevation of . It is the first facility to be licensed in the United States for horizontal launches of reusable spacecraft, being certified as a sp ...
in California. Block 40.6 allows the KC-135 to comply with
global air-traffic management {{Unreferenced, date=December 2009 Global air-traffic management (GATM) is a concept for satellite-based Communication, navigation and surveillance and air traffic management. The Federal Aviation Administration and the International Civil Aviation ...
. The latest block upgrade to the KC-135, the Block 45 program, is online with the first 45 upgraded aircraft delivered by January 2017. Block 45 adds a new
glass cockpit A glass cockpit is an aircraft cockpit that features electronic (digital) flight instrument displays, typically large LCD screens, rather than the traditional style of analog dials and gauges. While a traditional cockpit relies on numerous mech ...
digital display, radio altimeter, digital autopilot, digital flight director and computer updates. The original, no longer procurable, analog instruments, including all engine gauges, were replaced. Rockwell Collins again supplied the major avionic modules and the modification work is being done at Tinker AFB.


Further upgrades and derivatives

The KC-135Q variant was modified to carry
JP-7 Turbine Fuel Low Volatility JP-7, commonly known as JP-7 (referred to as Jet Propellant 7 prior to MIL-DTL-38219) is a specialized type of jet fuel developed in 1955 for the United States Air Force (USAF) for use in its supersonic military aircr ...
fuel necessary for the Lockheed SR-71 Blackbird by separating the JP-7 from the KC-135's own fuel supply (the body tanks carrying JP-7, and the wing tanks carrying JP-4 or
JP-8 JP-8, or JP8 (for "Jet Propellant 8") is a jet fuel, specified and used widely by the US military. It is specified by MIL-DTL-83133 and British Defence Standard 91-87, and similar to commercial aviation's Jet A-1, but with the addition of corrosi ...
). The tanker also had special fuel systems for moving the different fuels between different tanks. When the KC-135Q model received the CFM56 engines, it was redesignated the KC-135T model, which was capable of separating the main body tanks from the wing tanks where the KC-135 draws its engine fuel. The only external difference between a KC-135R and a KC-135T is the presence of a clear window on the underside of the empennage of the KC-135T where a remote controlled searchlight is mounted. It also has two ground refueling ports, located in each rear wheel well so ground crews can fuel both the body tanks and wing tanks separately. Eight KC-135R aircraft are receiver-capable tankers, commonly referred to as KC-135R(RT). All eight aircraft were with the 22d Air Refueling Wing at
McConnell AFB McConnell Air Force Base is a United States Air Force base located four miles (6 km) southeast of the central business district of Wichita, a city in Sedgwick County, Kansas, United States., effective 2007-12-20 The airbase was named in ...
, Kansas, in 1994. They are primarily used for force extension and Special Operations missions, and are crewed by highly qualified receiver capable crews. If not used for the receiver mission, these aircraft can be flown just like any other KC-135R. The Multi-point Refueling Systems (MPRS) modification adds refueling pods to the KC-135's wings. The pods allow refueling of U.S. Navy, U.S. Marine Corps and most NATO tactical jet aircraft while keeping the tail-mounted refueling boom. The pods themselves are Flight Refueling Limited MK.32B model pods, and refuel via the probe and drogue method common to Navy/Marine Corps tactical jets, rather than the primary "
flying boom Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the List of tanker aircraft, tanker) to another (the receive ...
" method used by Air Force fixed-wing aircraft. This allows the tanker to refuel two receivers at the same time, which increases throughput compared to the boom drogue adapter. A number of KC-135A and KC-135B aircraft have been modified to EC-135,
RC-135 The Boeing RC-135 is a family of large reconnaissance aircraft built by Boeing and modified by a number of companies, including General Dynamics, Lockheed, LTV, E-Systems, and L3 Technologies, and used by the United States Air Force and Roya ...
and
OC-135 The OC-135B Open Skies is a United States Air Force observation aircraft that supports the Treaty on Open Skies. The aircraft, a modified WC-135B, flies unarmed observation flights over participating parties of the treaty. Three OC-135B airc ...
configurations for use in several different roles (although these could also be considered variants of the
C-135 Stratolifter The Boeing C-135 Stratolifter is a transport aircraft derived from the prototype Boeing 367-80 jet airliner (also the basis for the 707) in the early 1950s. It has a narrower fuselage and is shorter than the 707. Boeing gave the aircraft the ...
family).


Design

The KC-135R has four
turbofan The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the ''turbo'' portion refers to a gas turbine engine which ac ...
engines, mounted under 35-degree swept wings, which power it to takeoffs at gross weights up to . Nearly all internal fuel can be pumped through the tanker's
flying boom Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the List of tanker aircraft, tanker) to another (the receive ...
, the KC-135's primary fuel transfer method. A boom operator stationed in the rear of the aircraft controls the boom while lying prone, viewing through a window at the bottom of the tail. Both the flying boom and operators station are similar to those of the previous
KC-97 The Boeing KC-97 Stratofreighter is a four-engined, piston-powered United States strategic tanker aircraft based on the Boeing C-97 Stratofreighter. It replaced the KB-29 and was succeeded by the Boeing KC-135 Stratotanker. Design and developme ...
. A special shuttlecock-shaped drogue, attached to and trailing behind the flying boom, may be used to refuel aircraft fitted with probes. This apparatus is significantly more unforgiving of pilot error in the receiving aircraft than conventional trailing hose arrangements; an aircraft so fitted is also incapable of refueling by the normal flying boom method until the attachment is removed. A cargo deck above the refueling system can hold a mixed load of passengers and cargo. Depending on fuel storage configuration, the KC-135 can carry up to of cargo.


Operational history


Introduction into service

The KC-135 was initially purchased to support bombers of the Strategic Air Command, but by the late 1960s, in the
Southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical United Nations geoscheme for Asia#South-eastern Asia, south-eastern region of Asia, consistin ...
theater, the KC-135 Stratotanker's ability as a force multiplier came to the fore. Midair refueling of
F-105 The Republic F-105 Thunderchief is an American supersonic fighter-bomber that served with the United States Air Force from 1958 to 1984. Capable of Mach 2, it conducted the majority of strike bombing missions during the early years of the Viet ...
and
F-4 The McDonnell Douglas F-4 Phantom II is an American tandem two-seat, twin-engine, all-weather, long-range supersonic jet interceptor and fighter-bomber originally developed by McDonnell Aircraft for the United States Navy.Swanborough and Bo ...
fighter-bombers as well as B-52 bombers brought far-flung bombing targets within reach, and allowed fighter missions to spend hours at the front, rather than a few minutes, which was usual due to their limited fuel reserves and high fuel consumption. KC-135 crews refueled both
Air Force An air force – in the broadest sense – is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an a ...
and
Navy A navy, naval force, or maritime force is the branch of a nation's armed forces principally designated for naval warfare, naval and amphibious warfare; namely, lake-borne, riverine, littoral zone, littoral, or ocean-borne combat operations and ...
/
Marine Corps Marines, or naval infantry, are typically a military force trained to operate in littoral zones in support of naval operations. Historically, tasks undertaken by marines have included helping maintain discipline and order aboard the ship (refl ...
aircraft; though they would have to change to
probe and drogue Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to another (the receiver) while both aircraft a ...
adapters depending upon the mission, the Navy and Marine Corps not having fitted their aircraft with flying boom receptacles since the USAF boom system was impractical for aircraft carrier operations. Crews also helped to bring in damaged aircraft which could sometimes fly while being fed by fuel to a landing site or to ditch over the water (specifically those with punctured fuel tanks). KC-135s continued their tactical support role in later conflicts such as
Operation Desert Storm Operation or Operations may refer to: Arts, entertainment and media * ''Operation'' (game), a battery-operated board game that challenges dexterity * Operation (music), a term used in musical set theory * ''Operations'' (magazine), Multi-Man ...
and current aerial strategy. SAC had the KC-135 Stratotanker in service with Regular Air Force SAC units from 1957 through 1992 and with SAC-gained ANG and AFRES units from 1975 through 1992. Following a major USAF reorganization that resulted in the inactivation of SAC in 1992, most KC-135s were reassigned to the newly created AMC. While AMC gained the preponderance of the aerial refueling mission, a small number of KC-135s were also assigned directly to
United States Air Forces in Europe United may refer to: Places * United, Pennsylvania, an unincorporated community * United, West Virginia, an unincorporated community Arts and entertainment Films * ''United'' (2003 film), a Norwegian film * ''United'' (2011 film), a BBC Two fi ...
(USAFE),
Pacific Air Forces Pacific Air Forces (PACAF) is a Major Command (MAJCOM) of the United States Air Force and is also the air component command of the United States Indo-Pacific Command (USINDOPACOM). PACAF is headquartered at Joint Base Pearl Harbor–Hickam (f ...
(PACAF) and the
Air Education and Training Command Air Education and Training Command (AETC) is one of the nine List of major commands of the United States Air Force, Major Commands (MAJCOM) of the United States Air Force (USAF), reporting to Headquarters, United States Air Force. It was establis ...
(AETC). All AFRC KC-135s and most of the ANG KC-135 fleet became operationally-gained by AMC, while
Alaska Air National Guard The Alaska Air National Guard (AK ANG) is the aerial militia of the State of Alaska, United States of America. It is, along with the Alaska Army National Guard, an element of the Alaska National Guard. As state military units, the units in th ...
and
Hawaii Air National Guard The Hawaii Air National Guard (HI ANG) is the aerial militia of the State of Hawaii, United States of America. It is, along with the Hawaii Army National Guard, an element of the Hawaii National Guard. As state militia units, the units in the ...
KC-135s became operationally-gained by PACAF. AMC manages 396 Stratotankers, of which the AFRC and ANG fly 243 in support of AMC's mission as of May 2018. The KC-135 is one of a few military aircraft types with over 50 years of continuous service with its original operator as of 2009. Israel was offered KC-135s again in 2013, after turning down the aging aircraft twice due to expense of keeping them flying. The IAF again rejected the offered KC-135Es, but said that it would consider up to a dozen of the newer KC-135Rs.


Research usage

Besides its primary role as an inflight aircraft refueler, the KC-135, designated NKC-135, has assisted in several research projects at the
NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding t ...
Armstrong Flight Research Center at Edwards Air Force Base, California. One such project occurred between 1979 and 1980 when special wingtip "
winglets Wingtip devices are intended to improve the efficiency of fixed-wing aircraft by reducing drag. Although there are several types of wing tip devices which function in different manners, their intended effect is always to reduce an aircraft' ...
", developed by Richard Whitcomb of the Langley Research Center, were tested at Armstrong, using an NKC-135A tanker loaned to NASA by the Air Force. Winglets are small, nearly vertical fins installed on an aircraft's wing tips. The results of the research showed that drag was reduced and
range Range may refer to: Geography * Range (geographic), a chain of hills or mountains; a somewhat linear, complex mountainous or hilly area (cordillera, sierra) ** Mountain range, a group of mountains bordered by lowlands * Range, a term used to i ...
could be increased by as much as 7 percent at cruise speeds. Winglets are now being incorporated into most new commercial and military transport/passenger jets, as well as business aviation jets. NASA also has operated several KC-135 aircraft (without the tanker equipment installed) as their famed
Vomit Comet A reduced-gravity aircraft is a type of fixed-wing aircraft that provides brief near-weightless environments for training astronauts, conducting research and making gravity-free movie shots. Versions of such airplanes were operated by the NAS ...
zero-gravity simulator aircraft. The longest-serving (1973 to 1995) version was KC-135A, AF Ser. No. ''59-1481'', named ''Weightless Wonder IV'' and registered as N930NA.


Replacements

Between 1993 and 2003, the amount of KC-135 depot maintenance work doubled, and the overhaul cost per aircraft tripled. In 1996, it cost $8,400 per flight hour for the KC-135, and in 2002 this had grown to $11,000. The Air Force's 15-year estimates project further significant cost growth through fiscal year 2017. KC-135 fleet operations and support costs were estimated to grow from about $2.2 billion in fiscal year 2003 to $5.1 billion (2003 dollars) in fiscal year 2017, an increase of over 130 percent, which represented an annual operating cost growth rate of about 6.2 percent. The Air Force projected that E and R models have lifetime flying hour limits of 36,000 and 39,000 hours, respectively. According to the Air Force, only a few KC-135s would reach these limits by 2040, when some aircraft would be about 80 years old. A later 2005 Air Force study estimated that KC-135Es upgraded to the R standard could remain in use until 2030. In 2006, the KC-135E fleet was flying an annual average of 350 hours per aircraft and the KC-135R fleet was flying an annual average of 710 hours per aircraft. The KC-135 fleet is currently flying double its planned yearly flying hour program to meet airborne refueling requirements, and has resulted in higher than forecast usage and sustainment costs. In March 2009, the Air Force indicated that KC-135s would require additional skin replacement to allow their continued use beyond 2018. The USAF decided to replace the KC-135 fleet. However, the fleet is large and will need to be replaced gradually. Initially the first batch of replacement planes was to be an air tanker version of the
Boeing 767 The Boeing 767 is an American wide-body aircraft developed and manufactured by Boeing Commercial Airplanes. The aircraft was launched as the 7X7 program on July 14, 1978, the prototype first flew on September 26, 1981, and it was certified on ...
, leased from
Boeing The Boeing Company () is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide. The company also provides leasing and product ...
. In 2003, this was changed to contract where the Air Force would purchase 80 KC-767 aircraft and lease 20 more. In December 2003, the Pentagon froze the contract and in January 2006, the KC-767 contract was canceled. This move followed public revelations of corruption in how the contract was awarded, as well as controversy regarding the original leasing rather than outright purchase agreement. The then Secretary of Defense Rumsfeld stated that that move would in no way impair the Air Force's ability to deliver the mission of the KC-767, which would be accomplished by implementing continuing upgrades to the KC-135 and
KC-10 Extender The McDonnell Douglas KC-10 Extender is an American aerial refueling tanker aircraft operated by the United States Air Force (USAF). A military version of the three-engine DC-10 airliner, the KC-10 was developed from the Advanced Tanker Cargo A ...
fleet. In January 2007, the U.S. Air Force formally launched the
KC-X KC-X is the United States Air Force (USAF) program to procure its next-generation aerial refueling tanker aircraft to replace some of the older Boeing KC-135 Stratotankers. The contest was for a production contract for 179 new tankers with est ...
program, with a request for proposal (RFP). KC-X was the first phase of three acquisition programs meant to replace the KC-135 fleet. On 29 February 2008, the US Defense Department announced that it had selected the EADS/
Northrop Grumman Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military techn ...
"KC-30" (to be designated the KC-45A) over the Boeing KC-767. Boeing protested the award on 11 March 2008, citing irregularities in the competition and bid evaluation. On 18 June 2008, the US
Government Accountability Office The U.S. Government Accountability Office (GAO) is a legislative branch government agency that provides auditing, evaluative, and investigative services for the United States Congress. It is the supreme audit institution of the federal govern ...
sustained Boeing's protest of the selection of the Northrop Grumman/EADS's tanker. In February 2010, the US Air Force restarted the KC-X competition with the release of a revised request for proposal (RFP). After evaluating bids, the USAF selected Boeing's 767-based tanker design, with the military designation KC-46, as a replacement in February 2011. The first KC-46A Pegasus was delivered to the U.S. Air Force on 10 January 2019. Two foreign users of the KC-135, the French Air Force and the
Republic of Singapore Air Force The Republic of Singapore Air Force (RSAF) is the aerial service branch of the Singapore Armed Forces (SAF) responsible for controlling and defending the airspace of the country, and providing air support to the Army and Navy. It was establi ...
took deliveries of Airbus A330 MRTTs as replacements for their Stratotankers.


Variants

;KC-135A: Original production version powered by four Pratt & Whitney J57s, 732 built. Given the Boeing model numbers 717-100A, 717-146 and 717-148. ; NKC-135A Test-configured KC-135A. ;KC-135B: Airborne command post version equipped with turbofan engines, 17 built. Provided with in-flight refueling capability and redesignated EC-135C.Donald, David. "Boeing Model 717 (C/KC-135 Stratoliner/Stratotanker)." ''The Complete Encyclopedia of World Aircraft''. Barnes & Noble Books, 1997. . Given the model number 717-166. ;KC-135D: All four RC-135As (''Pacer Swan'') were modified to partial KC-135A configuration in 1979.Hopkins, p.144 The four aircraft (serial numbers ''63-8058, 63-8059, 63-8060'' and ''63-8061'') were given a unique designation KC-135D as they differed from the KC-135A in that they were built with a flight engineer's position on the flight deck. The flight engineer's position was removed when the aircraft were modified to KC-135 standards but they retained their electrically powered wing flap secondary (emergency) drive mechanism and second air conditioning pack which had been used to cool the RC-135As on-board photo-mapping systems. Later re-engined with Pratt & Whitney TF33 engines and a cockpit update to KC-135E standards in 1990 and were retired to the 309th AMARG at Davis-Monthan AFB, AZ in 2007. ;KC-135E: Air National Guard and Air Force Reserve KC-135As re-engined with Pratt & Whitney TF33-PW-102 engines from retired 707 airliners (161 modified). All E model aircraft were retired to the 309th AMARG at Davis-Monthan AFB by September 2009 and replaced with R models. ;NKC-135E: Test-configured KC-135E. 55-3132 NKC-135E "Big Crow I" & 63-8050 NKC-135B "Big Crow II" used as airborne targets for the Boeing YAL-1 Airborne Laser carrier. ;KC-135Q: KC-135As modified to carry
JP-7 Turbine Fuel Low Volatility JP-7, commonly known as JP-7 (referred to as Jet Propellant 7 prior to MIL-DTL-38219) is a specialized type of jet fuel developed in 1955 for the United States Air Force (USAF) for use in its supersonic military aircr ...
fuel necessary for the SR-71 Blackbird, 56 modified, survivors to KC-135T. ;KC-135R (1960s): 4 JC/KC-135As converted to ''Rivet Stand'' (Later ''Rivet Quick'') configuration for reconnaissance and evaluation of above ground nuclear test (55-3121, 59–1465, 59–1514, 58–0126; 58-0126 replaced 59-1465 after it crashed in 1967). These aircraft were powered by Pratt & Whitney J57 engines and were based at
Offutt AFB Offutt Air Force Base is a U.S. Air Force base south of Omaha, adjacent to Bellevue in Sarpy County, Nebraska. It is the headquarters of the U.S. Strategic Command (USSTRATCOM), the 557th Weather Wing, and the 55th Wing (55 WG) of the Air ...
,
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...
. ;KC-135R: KC-135As and some KC-135Es re-engined with
CFM56 The CFM International CFM56 (U.S. military designation F108) series is a Franco-American family of high-bypass turbofan aircraft engines made by CFM International (CFMI), with a thrust range of . CFMI is a 50–50 joint-owned company of Safran ...
engines, more than 417 converted ;KC-135R(RT): Receiver-capable KC-135R Stratotanker; eight modified with either a Boeing or LTV receiver system and a secure voice SATCOM radio. Three of the aircraft (60-0356, -0357, and -0362) were converted to tankers from RC-135Ds, from which they retained their added equipment. ;KC-135T: KC-135Q re-engined with CFM56 engines, 54 modified. ;C-135F: A new-built variant for
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
as dual-role tanker/cargo and troop carrier aircraft. 12 were built for the French Air Force with the addition of a drogue adapter on the refueling boom. Given Boeing model numbers 717-164 and 717-165. ;C-135FR: 11 surviving C-135Fs upgraded with CFM International F108 turbofans between 1985 and 1988. Later modified with MPRS wing pods. ; EC-135Y: An airborne command post modified in 1984 to support CINCCENT. Aircraft 55-3125 was the only EC-135Y. Unlike its sister EC-135N, it was a true tanker that could also receive in-flight refueling. Pratt & Whitney TF33-PW-102. Retired to 309th AMARG at Davis-Monthan AFB, AZ.


Operators

; *
Chilean Air Force "With full speed to the stars" , colours = Indigo White , colours_label = , march = Alte Kameraden , mascot = , anniversaries = 21 March ...
operates 3 KC-135Es. It received its first KC-135E in February 2010. ; *
French Air and Space Force The French Air and Space Force (AAE) (french: Armée de l'air et de l'espace, ) is the air and space force of the French Armed Forces. It was the first military aviation force in history, formed in 1909 as the , a service arm of the French Ar ...
operates 11 C-135FRs and 3 KC-135Rs, which are being replaced by 15 Airbus A330 MRTTs, French military designation ''Phénix'', from 2018 to 2023. ; *
Turkish Air Force The Turkish Air Force ( tr, ) is the aerial warfare service branch of the Turkish Armed Forces. The Turkish Air Force can trace its origins back to June 1911 when it was founded by the Ottoman Empire, however, the air force as it is known to ...
operates 7 KC-135Rs. ; *
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal ...
operates 398 KC-135s (156
Active duty Active duty, in contrast to reserve duty, is a full-time occupation as part of a military force. In the United Kingdom and the Commonwealth of Nations, the equivalent term is active service. India The Indian Armed Forces are considered to be one ...
, 70 Air Force Reserve, and 172 Air National Guard) ."2017 USAF Almanac, Fact and Figures"
. Air Force Magazine, May 2017.
**
57th Wing The 57th Wing (57 WG) is an operational unit of the United States Air Force (USAF) Warfare Center, stationed at Nellis Air Force Base, Nevada. The 57 WG's mission is to provide well trained and well equipped combat forces ready to deploy ...
Nellis Air Force Base Nellis Air Force Base ("Nellis" colloq.) is a United States Air Force installation in southern Nevada. Nellis hosts air combat exercises such as Exercise Red Flag and close air support exercises such as Green Flag-West flown in " Military ...
,
Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
*** 509th Weapons Squadron
Fairchild Air Force Base Fairchild Air Force Base (AFB) is a United States Air Force base, located in the northwest United States in eastern Washington, approximately southwest of Spokane. The host unit at Fairchild is the 92nd Air Refueling Wing (92 ARW) assigned t ...
,
Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...
**
97th Air Mobility Wing The 97th Air Mobility Wing (97 AMW) is a United States Air Force (USAF) unit assigned to Nineteenth Air Force of Air Education and Training Command. It is stationed at Altus Air Force Base, Oklahoma. The wing is also the host unit at Altus. I ...
Altus Air Force Base Altus Air Force Base (Altus AFB, AAFB) is a United States Air Force base located approximately east-northeast of Altus, Oklahoma. The host unit at Altus AFB is the 97th Air Mobility Wing (97 AMW), assigned to the Nineteenth Air Force (19 AF ...
,
Oklahoma Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...
*** 54th Air Refueling Squadron ** 412th Test Wing
Edwards AFB Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, but its eastern end is in San Bernardino County and a southern arm is in Los Angeles County. The hub of the base is E ...
, California *** 412th Flight Test Squadron ***
418th Flight Test Squadron The 418th Flight Test Squadron is a United States Air Force squadron. It is assigned to the 412th Operations Group, Air Force Materiel Command, stationed at Edwards Air Force Base, California. The first predecessor of the squadron was acti ...
**
6th Air Refueling Wing The United States Air Force's 6th Air Refueling Wing is the host wing for MacDill Air Force Base, Florida. It is part of Air Mobility Command's (AMC) Eighteenth Air Force. The wing's 6th Operations Group is a successor organization of the 3d Ob ...
MacDill AFB MacDill Air Force Base (MacDill AFB) is an active United States Air Force installation located 4 miles (6.4 km) south-southwest of downtown Tampa, Florida. The "host wing" for MacDill AFB is the 6th Air Refueling Wing (6 ARW), assi ...
,
Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...
*** 50th Air Refueling Squadron ***
91st Air Refueling Squadron The 91st Air Refueling Squadron is part of the 6th Air Mobility Wing at MacDill Air Force Base, Florida. It operates the Boeing KC-135R Stratotanker aircraft conducting air refueling missions. The squadron was first activated in January 1941 ...
***
99th Air Refueling Squadron The 99th Air Refueling Squadron is part of the 6th Air Mobility Wing at MacDill Air Force Base, Florida, but is stationed at Birmingham Air National Guard Base, Alabama. It is an Active Associate Unit, an active duty component attached to the Al ...
Birmingham Air National Guard Base Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the West ...
,
Alabama (We dare defend our rights) , anthem = "Alabama (state song), Alabama" , image_map = Alabama in United States.svg , seat = Montgomery, Alabama, Montgomery , LargestCity = Huntsville, Alabama, Huntsville , LargestCounty = Baldwin County, Al ...
(Associate with 117th ARW) ** 22d Air Refueling Wing
McConnell AFB McConnell Air Force Base is a United States Air Force base located four miles (6 km) southeast of the central business district of Wichita, a city in Sedgwick County, Kansas, United States., effective 2007-12-20 The airbase was named in ...
,
Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the ...
*** 349th Air Refueling Squadron *** 350th Air Refueling Squadron **
92d Air Refueling Wing The 92d Air Refueling Wing is a United States Air Force unit assigned to the Air Mobility Command Eighteenth Air Force. It is stationed at Fairchild Air Force Base, Washington. The wing is also the host unit at Fairchild. The wing carries ou ...
Fairchild AFB Fairchild Air Force Base (AFB) is a United States Air Force base, located in the northwest United States in eastern Washington, approximately southwest of Spokane. The host unit at Fairchild is the 92nd Air Refueling Wing (92 ARW) assigned t ...
, Washington *** 92d Air Refueling Squadron *** 93d Air Refueling Squadron ***
97th Air Refueling Squadron The 97th Air Refueling Squadron is an active unit of the United States Air Force, stationed at Fairchild Air Force Base, Washington. It was most recently activated on 1 October 2019 and assigned to the 92nd Operations Group, 92nd Air Refuelin ...
*** 384th Air Refueling Squadron ***
912th Air Refueling Squadron The 912th Air Refueling Squadron is a United States Air Force squadron assigned to the 92d Operations Group and stationed at March Air Reserve Base, California. The squadron is an active duty associate unit of the reserve 336th Air Refueling Sq ...
March ARB March Air Reserve Base (March ARB), previously known as March Air Force Base (March AFB) is located in Riverside County, California between the cities of Riverside, Moreno Valley, and Perris. It is the home to the Air Force Reserve Command' ...
, California (Associate with 452d ARW) ** 375th Air Mobility Wing
Scott AFB Scott Air Force Base is a United States Air Force base in St. Clair County, Illinois, near Belleville and O'Fallon, east-southeast of downtown St. Louis. Scott Field was one of thirty-two Air Service training camps established after the Un ...
,
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
***
906th Air Refueling Squadron The 906th Air Refueling Squadron is an active United States Air Force unit. It is an active associate squadron and part of the 375th Air Mobility Wing at Scott Air Force Base, Illinois. The squadron was first activated in United States mil ...
(associate with 126th ARW) ** 18th Wing
Kadena AB (IATA: DNA, ICAO: RODN) is a highly strategic United States Air Force base in the towns of Kadena and Chatan and the city of Okinawa, in Okinawa Prefecture, Japan. It is often referred to as the "Keystone of the Pacific" because of its highl ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
***
909th Air Refueling Squadron The 909th Air Refueling Squadron is part of the 18th Wing at Kadena Air Base, Japan. It operates the KC-135 Stratotanker aircraft conducting air refueling missions. The squadron was first activated in 1942 as the 19th Reconnaissance Squadron, ...
** 100th Air Refueling Wing
RAF Mildenhall Royal Air Force Mildenhall or RAF Mildenhall is a Royal Air Force (RAF) station located near Mildenhall in Suffolk, England. Despite its status as a Royal Air Force station, it primarily supports United States Air Force (USAF) operations, ...
,
England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...
, UK *** 351st Air Refueling Squadron * Air Force Reserve ** 434th Air Refueling WingGrissom ARB,
Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th s ...
***72d Air Refueling Squadron ***74th Air Refueling Squadron ** 452d Air Mobility Wing – March Joint Air Reserve Base, March ARB, California ***336th Air Refueling Squadron ** 459th Air Refueling Wing – Andrews Air Force Base, Andrews AFB, Maryland ***756th Air Refueling Squadron ** 507th Air Refueling Wing – Tinker Air Force Base, Tinker AFB, Oklahoma ***465th Air Refueling Squadron ***730th Air Mobility Training Squadron (Altus AFB, Oklahoma) **914th Air Refueling Wing - Niagara Falls Air Reserve Station, Niagara Falls International Airport, New York (state), New York ***328th Air Refueling Squadron ** 927th Air Refueling Wing –
MacDill AFB MacDill Air Force Base (MacDill AFB) is an active United States Air Force installation located 4 miles (6.4 km) south-southwest of downtown Tampa, Florida. The "host wing" for MacDill AFB is the 6th Air Refueling Wing (6 ARW), assi ...
,
Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...
(Associate with 6th AMW) ***63d Air Refueling Squadron ** 931st Air Refueling Group –
McConnell AFB McConnell Air Force Base is a United States Air Force base located four miles (6 km) southeast of the central business district of Wichita, a city in Sedgwick County, Kansas, United States., effective 2007-12-20 The airbase was named in ...
,
Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the ...
(Associate with 22d ARW) ***18th Air Refueling Squadron ** 940th Air Refueling Wing – Beale AFB, California ***314th Air Refueling Squadron * Air National Guard ** 101st Air Refueling Wing – Bangor, Maine ***132d Air Refueilng Squadron ** 108th Wing – McGuire Air Force Base, McGuire AFB, New Jersey ***141st Air Refueling Squadron ** 117th Air Refueling Wing – Birmingham, Alabama ***106th Air Refueling Squadron ** 121st Air Refueling Wing – Rickenbacker Air National Guard Base, Rickenbacker ANGB, Ohio ***166th Air Refueling Squadron ** 126th Air Refueling Wing – Scott AFB, Illinois ***108th Air Refueling Squadron ** 127th Wing – Selfridge Air National Guard Base, Selfridge ANGB, Michigan ***171st Air Refueling Squadron ** 128th Air Refueling Wing – Milwaukee, Wisconsin ***126th Air Refueling Squadron ** 134th Air Refueling Wing – Knoxville, Tennessee ***151st Air Refueling Squadron ** 141st Air Refueling Wing – Fairchild AFB, Washington (Associate with 92d ARW) ***116th Air Refueling Squadron ** 151st Air Refueling Wing – Salt Lake City, Utah ***191st Air Refueling Squadron ** 154th Wing – Hickam AFB, Hawaii ***203d Air Refueling Squadron ** 155th Air Refueling Wing – Lincoln, Nebraska ***173rd Air Refueling Squadron ** 161st Air Refueling Wing – Phoenix Sky Harbor International Airport / Goldwater Air National Guard Base, Arizona ***197th Air Refueling Squadron ** 168th Air Refueling Wing – Eielson AFB, Alaska ***168th Air Refueling Squadron ** 171st Air Refueling Wing – Pittsburgh IAP Air Reserve Station, Pennsylvania ***146th Air Refueling Squadron ***147th Air Refueling Squadron ** 185th Air Refueling Wing – Sioux City,
Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...
***174th Air Refueling Squadron ** 186th Air Refueling Wing – Meridian, Mississippi ***153d Air Refueling Squadron ** 190th Air Refueling Wing – Topeka, Kansas ***117th Air Refueling Squadron * Meta Aerospace operates 4 KC-135Rs. These aircraft were purchased from the
Republic of Singapore Air Force The Republic of Singapore Air Force (RSAF) is the aerial service branch of the Singapore Armed Forces (SAF) responsible for controlling and defending the airspace of the country, and providing air support to the Army and Navy. It was establi ...
when the latter retired them in 2019. They were delivered in late 2020. Note Italy has been reported in some sources as operating several KC-135s, however these are actually Boeing 707-300s converted to tanker configuration.


Former operators

; *
Republic of Singapore Air Force The Republic of Singapore Air Force (RSAF) is the aerial service branch of the Singapore Armed Forces (SAF) responsible for controlling and defending the airspace of the country, and providing air support to the Army and Navy. It was establi ...
operated 4 former USAF KC-135R tankers, first delivered September 10, 1999; they were occasionally used as VIP, aeromedical transports and military support. The aircraft were retired in June 2019, having been replaced in service by 6 Airbus A330 MRTTs. They were subsequently purchased by private US defence services company Meta Aerospace in October 2020. ; *
NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding t ...
(until 2004) * United States Air Force **
6th Air Refueling Wing The United States Air Force's 6th Air Refueling Wing is the host wing for MacDill Air Force Base, Florida. It is part of Air Mobility Command's (AMC) Eighteenth Air Force. The wing's 6th Operations Group is a successor organization of the 3d Ob ...
MacDill AFB MacDill Air Force Base (MacDill AFB) is an active United States Air Force installation located 4 miles (6.4 km) south-southwest of downtown Tampa, Florida. The "host wing" for MacDill AFB is the 6th Air Refueling Wing (6 ARW), assi ...
,
Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...
***911th Air Refueling Squadron – Seymour-Johnson AFB, North Carolina (Associate with 916th ARW) ** 22d Air Refueling Wing
McConnell AFB McConnell Air Force Base is a United States Air Force base located four miles (6 km) southeast of the central business district of Wichita, a city in Sedgwick County, Kansas, United States., effective 2007-12-20 The airbase was named in ...
,
Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the ...
***344th Air Refueling Squadron **
97th Air Mobility Wing The 97th Air Mobility Wing (97 AMW) is a United States Air Force (USAF) unit assigned to Nineteenth Air Force of Air Education and Training Command. It is stationed at Altus Air Force Base, Oklahoma. The wing is also the host unit at Altus. I ...
Altus Air Force Base Altus Air Force Base (Altus AFB, AAFB) is a United States Air Force base located approximately east-northeast of Altus, Oklahoma. The host unit at Altus AFB is the 97th Air Mobility Wing (97 AMW), assigned to the Nineteenth Air Force (19 AF ...
,
Oklahoma Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...
***55th Air Refueling Squadron (1994-2009) ** 916th Air Refueling Wing – Seymour Johnson Air Force Base, Seymour Johnson AFB, North Carolina ***77th Air Refueling Squadron ** 931st Air Refueling Group –
McConnell AFB McConnell Air Force Base is a United States Air Force base located four miles (6 km) southeast of the central business district of Wichita, a city in Sedgwick County, Kansas, United States., effective 2007-12-20 The airbase was named in ...
,
Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the ...
(Associate with 22d ARW) ***924th Air Refueling Squadron * Air National Guard ** 107th Attack Wing, 107th Air Refueling Wing – Niagara Falls Air Reserve Station, Niagara Falls ARS, New York *** 136th Attack Squadron, 136th Air Refueling Squadron (1994–2008) ** 121st Air Refueling Wing – Rickenbacker ANGB, Ohio *** 145th Air Refueling Squadron (1975–2013) ** 137th Special Operations Wing, 137th Air Refueling Wing – Tinker AFB, Oklahoma *** 185th Special Operations Squadron, 185th Air Refueling Squadron (2008–2015) ** 157th Air Refueling Wing – Pease Air National Guard Base, Pease ANGB, New Hampshire *** 133d Air Refueling Squadron (1975–2019) ** 163d Attack Wing, 163rd Air Refueling Wing – March ARB, California *** 196th Attack Squadron, 196th Air Refueling Squadron (1993–2006) ** 184th Wing, 184th Air Refueling Wing – McConnell AFB, Kansas *** 127th Command and Control Squadron, 127th Air Refueling Squadron (2002–2008) ** 189th Airlift Wing, 189th Air Refueling Wing – Little Rock Air Force Base, Little Rock AFB, Arkansas *** 154th Training Squadron, 154th Air Refueling Squadron (1973–1986)


Accidents

As of 2020, 52 Stratotankers have been lost to accidents during the over sixty years of service, involving 385 fatalities. ;27 June 1958: USAF KC-135A, United States military aircraft serials, serial number ''56-3599'', stalled and crashed at Westover Air Force Base after the crew failed to extend the flaps on takeoff, killing all 15 on board. The aircraft was attempting a world speed record between New York and London. ;31 March 1959: USAF KC-135A, ''58-0002'', entered a thunderstorm near Killeen, Texas. Two engines separated and one of the engines struck the tail, causing loss of control. The aircraft crashed on a hillside, killing all four crew on board. The aircraft had been delivered just six weeks before the accident. ;15 October 1959: USAF KC-135A, ''57-1513'', collided in mid-air with B-52F ''57-0036'' at over Leitchfield, Kentucky, killing all six on board both aircraft. ;3 February 1960: USAF KC-135A, 56–3628, crashed on takeoff in extremely gusty crosswind conditions at Roswell-Walker AFB, NM. The airplane skidded into two other KC-135 tankers (57-1449 and 57–1457) and a hangar and burst into flames. The aircraft was on a training flight, but the instructor pilot was occupying the jump seat instead of one of the pilot seats as directed by the local commander. The destruction of three aircraft, along with the death of all six in the crew plus an additional two deaths on the ground made this a unique mishap. ;18 November 1960: USAF KC-135A, ''56-3605'', crashed on landing at Loring Air Force Base due to an excessive sink rate, killing one of 17 on board. ;9 May 1962: USAF KC-135A, ''56-3618'', crashed on takeoff from Loring Air Force Base due to engine failure, killing all six on board. ;8 August 1962: USAF KC-135A, ''55-3144'', crashed on approach to Runway 11 at Hanscom Field in Bedford, Massachusetts, killing all three on board. Stock footage of this same aircraft had been used during the opening credits of the film ''Dr. Strangelove''. ;10 September 1962: USAF KC-135A, ''60-0352'' on a flight from Ellsworth Air Force Base to
Fairchild Air Force Base Fairchild Air Force Base (AFB) is a United States Air Force base, located in the northwest United States in eastern Washington, approximately southwest of Spokane. The host unit at Fairchild is the 92nd Air Refueling Wing (92 ARW) assigned t ...
crashed into a mountain just 20 miles (32 km) northeast of Spokane, Washington. The flight hit fog on approach to the air base and hit Mount Kit Carson, a mountain. The crash killed all four crew and 40 passengers on board. ;27 February 1963: USAF KC-135A, ''56-3597'', crashed on takeoff at Eielson Air Force Base due to engine separation, killing all seven on board; two on the ground died when debris from the crash struck a guard house and nearby waiting room. ;21 June 1963: USAF KC-135A-BN Stratotanker, 57-1498 out of Westover AFB crashed on approach during a training flight in a wooded area near Belchertown, MA. One of the four occupants was killed. ;28 August 1963: USAF KC-135A, ''61-0322'', collided in mid-air with KC-135A ''61-0319'' west of Bermuda, killing all 11 on board both aircraft. ;8 July 1964: USAF KC-135A, ''60-0340'', collided in mid-air with F-105 Thunderchief ''61-0091'' during in-flight refueling over Death Valley, California, killing all five on board both aircraft. ;4 January 1965: USAF KC-135A, ''61-0265'', crashed on climbout from Loring Air Force Base after two engines separated, killing all four on board. ;16 January 1965: USAF KC-135A ''57-1442'', 1965 USAF KC-135 Wichita crash, crashed after its rudder control system suffered a malfunction shortly after takeoff from McConnell Air Force Base, Kansas. The fuel-laden plane crashed in northeast Wichita at a street intersection and caused a considerable fire. A total of 30 were killed, including 23 on the ground and the seven member crew. ;26 February 1965: USAF KC-135A, ''63-8882'', collided in mid-air with B-47E ''52-0171'' over the Atlantic Ocean, killing all eight on board both aircraft. ;3 June 1965: USAF KC-135A, ''63-0842'', lost electrical power on takeoff and crashed at Walker Air Force Base, killing all five on board. ;17 January 1966: 1966 Palomares B-52 crash, A fatal collision occurred between a B-52G, ''58-0256'', and a KC-135A, ''61-0273'', flying out of Moron AB, Spain while flying over Palomares, Almería, Palomares, Spain. The B-52G was on an Operation Chrome Dome mission, which required multiple air refuelings. The mishap caused both aircraft to break up in mid-air and killed all four crew members on the KC-135A and three of the seven on the B-52G, while causing radiological contamination, as nuclear weapons had to be recovered from on land and at sea, nearby. ;19 May 1966: USAF KC-135A, ''57-1444'', of 4252nd Strategic Wing, crashed on takeoff from Kadena Air Base, killing all 11 on board as well as a motorist on nearby Highway 16. The aircraft was bound for Yokota Air Base to repair a KC-135 when it lifted off too soon during a heavy-weight takeoff. ;19 January 1967: USAF KC-135A, ''56-3613'', crashed into Shadow Mountain, foothill of Mount Spokane (elevation MSL) while descending towards Fairchild Air Force Base, killing all nine on board. ;17 January 1968: USAF KC-135A, ''58-0026'', stalled and crashed at Minot Air Force Base after the pilot overrotated the aircraft during takeoff in a snowstorm, killing all 13 on board including the 15th Air Force Vice Commander MGen Charles Eisenhart. This accident was instrumental in the decision to refit the KC-135 fleet with the Collins FD-109(V) integrated flight director system, in place of the earlier "round dial" cockpit layout. ;30 July 1968: USAF KC-135A, ''56-3655'', crashed on Mount Lassen after the vertical stabilizer broke off after a sharp turn while practicing an emergency descent, killing all nine on board. ;24 September 1968: USAF KC-135A, "55-3133A", crashed on landing at Wake Island, Micronesia. Aircraft developed engine problems while en route from Andersen AFB, Guam to Hickam AFB, HI and during landing at Wake Island the aircraft contacted the surface of the water and bounced onto the east end of the runway. There were 11 fatalities out 56 persons on board. ;1 October 1968: USAF KC-135A, ''55-3138'', struck concrete and steel light poles on takeoff and crashed at U-Tapao Airport, Thailand after a loss of power in an engine and resultant loss of control, killing all four on board. ;22 October 1968: USAF KC-135A, ''61-0301'', flew into a mountain while descending to Ching Chuan Kang Air Base, Taiwan, killing all six on board. ;19 December 1969: USAF KC-135A, ''56-3629'', crashed into the sea on climbout from Ching Chuan Kang Air Base due to low-level windshear, killing all four on board. ;3 June 1971: USAF KC-135Q, ''58-0039'', exploded in mid-air and crashed at Centenera, Spain, killing all five on board. ;13 March 1972: KC-135A, ''58-0048'', crashed while landing at Carswell AFB. Its right wing struck the ground, which led to the airplane exploding and killing all 5 on board. ;8 March 1973: USAF KC-135A, ''63-7989'', collided with KC-135 ''63-7980'' on the ramp at Lockbourne Air Force Base and caught fire, killing two of five on board. ;7 December 1975: USAF KC-135A, ''60-0354'', from Plattsburgh AFB, NY, crashed after takeoff at Eielson AFB, AK, killing all four crewmembers. Launch was delayed because of problems with the receiver aircraft. The KC-135 was required to sit at the end of the runway in extremely cold weather, without heat, with engines shut down. Repeated requests for a mobile heat source were denied by the command post. Landing gear failed to retract after takeoff. Crewmembers may have suffered from hypothermia. ;6 February 1976: USAF KC-135A, ''60-0368'', flew into a mountain while descending to Torrejon Air Base, Spain, killing all seven on board. The aircraft was assigned to the 410th BMW/46th AREFS at K.I. Sawyer AFB, Michigan, but, as is often the case on Tanker Task Force deployed operations, the flight crew was from another SAC unit at Seymour-Johnson AFB, NC. Only two aircraft crew chiefs on board were from K I Sawyer AFB, MI. ;26 September 1976: USAF KC-135A, ''61-0296'', crashed while on approach to Wurtsmith Air Force Base, Michigan, killing 15 passengers and flight crew on board. The aircraft was flying a ''"First Team"'' mission taking 10 passengers to HQ-Strategic Air Command for briefings and orientation. The crew became distracted by a cabin pressurization problem after an intermediate stop and descended into a wooded area about southwest of Alpena, Michigan. There was one survivor, reportedly a crew chief who was in the boom operator aft station (boom pod) at the time of the crash. ;29 April 1977: USAF KC-135A, ''58-0101'' from Castle AFB hit five or six cows while practicing night takeoffs and landings at Beale AFB. Takeoff was aborted and the plane overran the runway and caught on fire. Of the crew of 7, there were no fatalities. During that time cattle strayed through a broken fence from a nearby field and onto the runway. ;19 September 1979: USAF KC-135A, ''58-0127'', from Castle AFB crashed on the runway during a simulated engine failure on a training flight, killing 15 of 20 occupants on board. ;13 March 1982: Arizona ANG KC-135A, ''57-1489'' collided in mid-air with a civilian Grumman-American AA-1 Yankee near Luke AFB, AZ. The collision, which occurred as the tanker was descending on an IFR flight plan through an undercast, was struck by the civilian aircraft operating VFR just below the cloud deck, causing the tail of the KC-135 to be severed by the force of the impact. The two civilians on the AA-1 and all four crew on the KC-135 were killed. Included among the dead was the squadron commander of the 197th AREFS, Lt Col James N. Floor. ;19 March 1982: USAF KC-135A, ''58-0031'', exploded in mid-air at and crashed at Greenwood, Illinois, due to a possible overheated fuel pump, killing all 27 on board. ;19 March 1985: USAF 8th AF KC-135A ''61-0316'' caught fire during ground refueling at Cairo International Airport (CAI), Cairo, Egypt. The interior of the airplane was burned out and the aircraft was written off as damaged beyond repair although the wing structure was used in repairing KC-135A ''58-0014'' (which was later converted to a KC-135E). There were no injuries reported. ;28 August 1985: USAF KC-135A ''59-1443'' was damaged beyond repair when a student pilot allowed an engine to contact the runway during a landing attempt at Beale Air Force Base near Marysville, California. During the go-around the instructor lost control of the aircraft while performing checklist items for an in-flight fire. All seven (three instructors and four students) aboard the aircraft died in the crash. ;17 June 1986: USAF KC-135A,''63-7983'', crashed while en route to Howard Air Force Base, Howard AFB, Panama. It struck a hill south of the nearby Rodman Naval Station, killing all four crew members on board. The tanker and crew were based at Grissom Air Reserve Base, Grissom Air Force Base, Indiana. ;13 March 1987: USAF KC-135A, ''60-0361'', crashed at Fairchild Air Force Base after encountering wake turbulence from a B-52, while practicing a low-level refueling display. The aircraft rolled 80 degrees to the left, which stalled both left side engines (#1 and #2). The crew was able to recover to wings level, but were too low and impacted the ground in an open area of the base. The accident killed all six on board and one person on the ground. ;11 October 1988: USAF KC-135A, ''60-0317'', crashed at Wurtsmith Force Base after a hard landing following a steep approach during crosswinds. The airplane went off the side of the runway and broke up. A fire erupted and killed all six crewmembers on board, while 10 passengers were able to jump to safety. Pilot error was determined as the cause of the accident. ;20 November 1988: USAF KC-135 suffered a failure of a sighting window next to the sextant port in the cockpit during a trans-Atlantic flight. A boom operator died when he was sucked partway through the 10-inch by 8-inch window opening as the cockpit depressurized. None of the 17 others on board were injured. ;31 January 1989: USAF KC-135A, ''63-7990'', crashed on takeoff from Dyess AFB, TX after the water-injection system for the Pratt & Whitney J-57 engines failed and the remaining "dry" thrust was insufficient for flight at the takeoff gross weight. The mission was scheduled as a non-stop flight to Hickam AFB/Honolulu HI with an en route F-16 air refueling mission. 7 crew members and 12 passengers, including military spouses, retired military members and one child, were killed. The aircraft and crew were based at K I Sawyer AFB, MI. ;20 September 1989: USAF KC-135E, ''57-1481'', exploded on the ground at Eielson Air Force Base due to an overheated fuel pump, killing two of seven on board. The crew was shutting down the engines when the explosion occurred. ;4 October 1989: KC-135A, ''56-3592'', from en route from Loring Air Force Base crashed into a hill along the west side of New Brunswick Route 2, Trans-Canada Highway 2 at Carlingford, New Brunswick, Carlingford, New Brunswick due to an overheated fuel pump, killing all four crew members. After five accidents involving fuel pump overheating, crews were to keep of fuel in the tank. ;11 January 1990: KC-135E, ''59-1494'', caught fire on the Asphalt concrete, tarmac at Pease Air National Guard Base during maintenance work; there were no injuries, however the aircraft was destroyed. ;6 February 1991: KC-135E, call sign "Whale 05", ''58-0013'' , flown by Maj. Kevin Sweeney (pilot), Capt. Jay Selanders (co-pilot), Capt. Greg Mermis (navigator), and Senior Master Sgt. Steve Stucky (boom operator), during the Gulf War, after entering severe wake turbulence from a passing KC-135, the plane lost both engines from under the left wing. The crew landed it successfully and it was later returned in service. The entire crew received the Distinguished Flying Cross (United States), Distinguished Flying Cross for their actions. This accident was covered in ''Air Disasters'' episode "Mission Disaster" in 2021. ;10 December 1993: a Wisconsin Air National Guard KC-135R, ''57-1470'', exploded while undergoing routine ground maintenance at General Mitchell Air National Guard Base due to an overheated fuel pump. Six Non-commissioned officer, NCO maintenance personnel were killed. ;13 January 1999: Washington Air National Guard KC-135E, ''59-1452'', crashed on approach in Geilenkirchen, Germany due to the horizontal stabilizer being in a 7.5 nose-up trim condition, killing all 4 crew members. ;7 April 1999: Air National Guard KC-135R, ''57-1418'', was damaged beyond repair while undergoing a cabin pressurization check while in depot maintenance at the Oklahoma City Air Logistics Center at Tinker AFB, Oklahoma. During a previous maintenance event, the pressure relief valves were secured shut and not released afterwards. This created a catastrophic explosion that nearly separated the empennage from the aircraft and destroyed the aft fuselage section. No personnel were injured or killed during the mishap, but the aircraft was a total loss. ;26 September 2006: USAF KC-135R, ''63-8886'', was damaged beyond economical repair when it was struck by a Tupolev Tu-154 of Altyn Air, ''EX-85718'', while stopped on a taxiway after landing at Transit Center at Manas, Manas Air Base. As the Tu-154 took off, its right wing struck the fairing of the KC-135R's No. 1 engine. The force of the impact nearly severed the No. 1 engine and destroyed a portion of the left wing. The resulting fire caused extensive damage to the KC-135. The Tu-154 lost about of its right wingtip, but was able to get airborne and return to the airport for an emergency landing. The tanker crew had been directed to use a taxiway which was not usable for night operations and the controller failed to note that they reported "holding short" of that taxiway, rather than "clear of" that point. The crew of the KC-135 evacuated the aircraft without serious injuries. ;3 May 2013: A
McConnell AFB McConnell Air Force Base is a United States Air Force base located four miles (6 km) southeast of the central business district of Wichita, a city in Sedgwick County, Kansas, United States., effective 2007-12-20 The airbase was named in ...
, KS (USAF) KC-135R, ''63-8877'', flown by a Fairchild AFB, Washington aircrew, broke up in flight about eight minutes after taking off from Transit Center at Manas, Manas Air base in Kyrgyzstan, killing all three crew members. After investigation, it was determined that a rudder power control unit malfunction led to a Dutch roll oscillatory instability. Not recognizing the Dutch roll, the crew used the rudder to stay on course, which exacerbated the instability, leading to an unrecoverable flight condition. The over-stressed tail section detached and the aircraft broke apart soon after. The aircraft was at cruise altitude about 200 km west of Bishkek before it crashed in a mountainous area near the village of Chorgolu, close to the border between Kyrgyzstan and Kazakhstan.


Aircraft on display

* 55-3118 ''The City of Renton'' – KC-135A on static display at the entrance to McConnell Air Force Base,
Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the ...
. It was the first aircraft built and was used in a variety of test roles. It was later converted to an EC-135K before reverting to a tanker configuration. * 55-3130 ''Old Grandad'' – KC-135A on static display at the March Field Air Museum,
March ARB March Air Reserve Base (March ARB), previously known as March Air Force Base (March AFB) is located in Riverside County, California between the cities of Riverside, Moreno Valley, and Perris. It is the home to the Air Force Reserve Command' ...
, California. * 55-3139 ''City of Atwater'' – KC-135A on static display at the Castle Air Museum at the former Castle AFB, California. * 56-3595 – KC-135A on static display at the Barksdale Global Power Museum at Barksdale Air Force Base, Louisiana. * 56-3611 – KC-135E on static display Scott Field Heritage Air Park at Scott Air Force Base,
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
. * 56-3639 – KC-135A on static display at the Linear Air Park at Dyess Air Force Base, Texas. * 56-3658 ''Iron Eagle'' – KC-135E on static display at the Kansas Aviation Museum. * 57-1429 – KC-135E on static display at the Museum of the Kansas National Guard at Forbes Field (airport), Forbes Field Air National Guard Base in Kansas. * 57-1458 – KC-135E on static display at Eielson Air Force Base, Alaska. * 57-1495 – KC-135E in storage at Lincoln Air National Guard Base,
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...
. * 57-1507 – KC-135E on static display at the Air Mobility Command Museum at Dover Air Force Base, Delaware. * 57-1510 ''Never Forget'' – KC-135E on static display at the Hill Aerospace Museum at Hill Air Force Base, Utah. * 59-1481 – KC-135A on static display at Ellington Field Joint Reserve Base, Texas. It was operated by NASA as N930NA and one of two KC-135s used for zero-gravity and other research purposes. * 59-1487 – KC-135E on static display at the 126th Air Refueling Wing / Illinois Air National Guard complex at Scott Air Force Base. * 59-1497 – KC-135E on static display at Joint Base McGuire-Dix-Lakehurst, New Jersey. * 60-0329 – KC-135R stored at the National Museum of the United States Air Force in Dayton, Ohio, pending future display. * 63-7998 – KC-135A on static display at the Pima Air & Space Museum, adjacent to Davis-Monthan AFB, Arizona. It was operated by NASA as N931NA and is the second of their two research aircraft. * 63-8005 – KC-135A on static display at Grand Forks AFB, North Dakota.


Specifications (KC-135R)


See also


References


Bibliography

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External links


USAF KC-135 fact sheet
an
photo gallery at official USAF website
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KC-135 history page
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- (not updated since late 1999, but still perhaps useful)

- Includes specs for many variants
Smart Tankers (Defence Today)
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National Museum of the Air Force video tour of KC-135
{{DEFAULTSORT:Boeing KC-135 Stratotanker Air refueling Boeing military aircraft, KC-135 Stratotanker 1950s United States military tanker aircraft, KC-135 Stratotanker Quadjets Low-wing aircraft Aircraft first flown in 1956