An AIRPORT is an aerodrome with extended facilities, mostly for commercial air transport. Airports often have facilities to store and maintain aircraft, and a control tower . An airport consists of a landing area , which comprises an aerially accessible open space including at least one operationally active surface such as a runway for a plane to take off or a helipad , and often includes adjacent utility buildings such as control towers , hangars and terminals . Larger airports may have fixed-base operator services , airport aprons , taxiway bridges , air traffic control centres, passenger facilities such as restaurants and lounges , and emergency services .
An airport with a helipad for rotorcraft but no runway is called a heliport . An airport for use by seaplanes and amphibious aircraft is called a seaplane base . Such a base typically includes a stretch of open water for takeoffs and landings , and seaplane docks for tying-up.
An international airport has additional facilities for customs and passport control .
In warfare , airports can become the focus of intense fighting, for
Battle of Tripoli Airport
Most of the world's airports are owned by local , regional , or national government bodies.
* 1 Landside and airside areas
Air traffic control
* 4 Infrastructure
* 7.5 Lighting
* 11 Airports in entertainment
* 11.1 Filming at airports
LANDSIDE AND AIRSIDE AREAS
Airports are divided into landside and airside. Landside includes
areas such as check-in , parking lots , public transport railway
stations and access roads . Airside includes all areas accessible to
aircraft, including runways, taxiways and apron/ramps . Passage
between landside and airside is tightly controlled at all airports. To
access airside, one must go through Security, and if applicable,
Most major airports provide commercial outlets for products and services. Airports may also contain premium and VIP services. The premium and VIP services may include express check-in and dedicated check-in counters. In addition to people, airports move cargo around the clock. Many large airports are located near railway trunk routes.
AIR TRAFFIC CONTROL PRESENCE
Commercial jets wait for the "7am hold" to pass before departing from John Wayne Airport , Feb 14, 2015
The majority of the world's airports are non-towered , with no air traffic control presence. Busy airports have air traffic control (ATC) system. All airports use a traffic pattern to assure smooth traffic flow between departing and arriving aircraft. There are a number of aids available to pilots , though not all airports are equipped with them. Many airports have lighting that help guide planes using the runways and taxiways at night or in rain , snow , or fog . In the U.S. and Canada, the vast majority of airports, large and small, will either have some form of automated airport weather station , a human observer or a combination of the two. Air safety is an important concern in the operation of an airport, and airports often have their own safety services.
The terms _aerodrome _, _airfield_, and _airstrip _ may also be used to refer to airports, and the terms _heliport _, _seaplane base_, and _ STOLport _ refer to airports dedicated exclusively to helicopters , seaplanes , or short take-off and landing aircraft.
In colloquial use, the terms _airport_ and _aerodrome_ are often interchanged. However, in general, the term _airport_ may imply or confer a certain stature upon the aviation facility that an aerodrome may not have achieved. In some jurisdictions, _airport_ is a legal term of art reserved exclusively for those aerodromes certified or licensed as airports by the relevant national aviation authority after meeting specified certification criteria or regulatory requirements.
That is to say, all airports are aerodromes, but not all aerodromes are airports. In jurisdictions where there is no legal distinction between _aerodrome_ and _airport_, which term to use in the name of an aerodrome may be a commercial decision. _Aerodrome_ is uncommon in the United States.
Smaller or less-developed airports, which represent the vast majority, often have a single runway shorter than 1,000 m (3,300 ft). Larger airports for airline flights generally have paved runways 2,000 m (6,600 ft) or longer. Many small airports have dirt, grass , or gravel runways, rather than asphalt or concrete .
In the United States, the minimum dimensions for dry, hard landing
fields are defined by the FAR
The longest public-use runway in the world is at Qamdo Bamda Airport in China. It has a length of 5,500 m (18,045 ft). The world's widest paved runway is at Ulyanovsk Vostochny Airport in Russia and is 105 m (344 ft) wide.
As of 2009 , the CIA stated that there were approximately 44,000 "... airports or airfields recognizable from the air" around the world, including 15,095 in the US, the US having the most in the world.
AIRPORT OWNERSHIP AND OPERATION
Berlin Brandenburg Airport
Most of the world's airports are owned by local , regional , or
national government bodies who then lease the airport to private
corporations who oversee the airport's operation. For example, in the
United Kingdom the state-owned British Airports Authority originally
operated eight of the nation's major commercial airports - it was
subsequently privatized in the late 1980s, and following its takeover
by the Spanish
Ferrovial consortium in 2006, has been further divested
and downsized to operating just Heathrow now. Germany's Frankfurt
In the United States commercial airports are generally operated directly by government entities or government-created airport authorities (also known as port authorities ), such as the Los Angeles World Airports authority that oversees several airports in the Greater Los Angeles area , including Los Angeles International Airport .
In Canada, the federal authority, Transport Canada, divested itself of all but the remotest airports in 1999/2000. Now most airports in Canada are owned and operated by individual legal authorities or are municipally owned.
Many U.S. airports still lease part or all of their facilities to
outside firms, who operate functions such as retail management and
parking. In the U.S., all commercial airport runways are certified by
Despite the reluctance to privatize airports in the US (despite the
Play media Terminal structures at Sheremetyevo International
Airports are divided into landside and airside areas. Landside areas include parking lots , public transportation train stations and access roads . Airside areas include all areas accessible to aircraft, including runways, taxiways and aprons . Access from landside areas to airside areas is tightly controlled at most airports. Passengers on commercial flights access airside areas through terminals , where they can purchase tickets, clear security check, or claim luggage and board aircraft through gates . The waiting areas which provide passenger access to aircraft are typically called concourses, although this term is often used interchangeably with terminal. The apron from the top floor observation room, Halifax International Airport, Canada
The area where aircraft park next to a terminal to load passengers and baggage is known as a _ramp_ (or incorrectly, "the tarmac "). Parking areas for aircraft away from terminals are called aprons.
Airports can be towered or non-towered , depending on air traffic
density and available funds. Due to their high capacity and busy
airspace , many international airports have air traffic control
located on site. Terminal 2 at
Airports with international flights have customs and immigration facilities. However, as some countries have agreements that allow travel between them without customs and immigrations, such facilities are not a definitive need for an international airport. International flights often require a higher level of physical security, although in recent years, many countries have adopted the same level of security for international and domestic travel.
Some airport structures include on-site hotels built within or
attached to a terminal building.
"Floating airports " are being designed which could be located out at sea and which would use designs such as pneumatic stabilized platform technology.
PRODUCTS AND SERVICES
Most major airports provide commercial outlets for products and services. Most of these companies, many of which are internationally known brands, are located within the departure areas. These include clothing boutiques and restaurants. Prices charged for items sold at these outlets are generally higher than those outside the airport. However, some airports now regulate costs to keep them comparable to "street prices". This term is misleading as prices often match the manufacturers' suggested retail price (MSRP) but are almost never discounted.
Apart from major fast food chains, some airport restaurants offer regional cuisine specialties for those in transit so that they may sample local food or culture without leaving the airport.
Major airports in such countries as Russia and Japan offer miniature sleeping units within the airport that are available for rent by the hour. The smallest type is the capsule hotel popular in Japan. A slightly larger variety is known as a sleep box . An even larger type is provided by the company YOTEL .
PREMIUM AND VIP SERVICES
Airports may also contain premium and VIP services. The premium and VIP services may include express check-in and dedicated check-in counters. These services are usually reserved for First and Business class passengers, premium frequent flyers , and members of the airline's clubs. Premium services may sometimes be open to passengers who are members of a different airline's frequent flyer program. This can sometimes be part of a reciprocal deal, as when multiple airlines are part of the same alliance, or as a ploy to attract premium customers away from rival airlines.
Sometimes these premium services will be offered to a non-premium passenger if the airline has made a mistake in handling of the passenger, such as unreasonable delays or mishandling of checked baggage.
Airlines sometimes operate multiple lounges within the one airport terminal allowing ultra-premium customers, such as first class customers, additional services, which are not available to other premium customers. Multiple lounges may also prevent overcrowding of the lounge facilities.
CARGO AND FREIGHT SERVICES
In addition to people, airports move cargo around the clock. Cargo airlines often have their own on-site and adjacent infrastructure to transfer parcels between ground and air.
Cargo Terminal Facilities are areas where international airports export cargo has to be stored after customs clearance and prior to loading on the aircraft. Similarly import cargo that is offloaded needs to be in bond before the consignee decides to take delivery. Areas have to be kept aside for examination of export and import cargo by the airport authorities. Designated areas or sheds may be given to airlines or freight forward ring agencies.
Every cargo terminal has a landside and an airside. The landside is
where the exporters and importers through either their agents or by
themselves deliver or collect shipments while the airside is where
loads are moved to or from the aircraft. In addition cargo terminals
are divided into distinct areas – export, import and interline or
Recife International Airport in
Aircraft and Passenger Boarding Bridges Maintenance, Pilot Operations, Commissioning, Training Services, aircraft rental, and hangar rental are most often performed by a fixed-base operator (FBO). At major airports, particularly those used as hubs , airlines may operate their own support facilities.
Some airports, typically military airbases, have long runways used as emergency landing sites. Many airbases have arresting equipment for fast aircraft, known as arresting gear – a strong cable suspended just above the runway and attached to a hydraulic reduction gear mechanism. Together with the landing aircraft's arresting hook , it is used in situations where the aircraft's brakes would be insufficient by themselves.
In the United States, many larger civilian airports also host an Air
National Guard base. The New Delhi International
Many large airports are located near railway trunk routes for
seamless connection of multimodal transport , for instance Frankfurt
The distances passengers need to move within a large airport can be
substantial. It is common for airports to provide moving walkways and
buses. In 2007,
HISTORY AND DEVELOPMENT
The earliest aircraft takeoff and landing sites were grassy fields. The plane could approach at any angle that provided a favorable wind direction. A slight improvement was the dirt-only field, which eliminated the drag from grass. However, these only functioned well in dry conditions. Later, concrete surfaces would allow landings, rain or shine, day or night.
The title of "world's oldest airport" is disputed, but College Park
Hamburg Airport opened in January 1911, making it the oldest airport
in the world which is still in operation.
Following the war, some of these military airfields added civil
facilities for handling passenger traffic. One of the earliest such
Paris – Le Bourget Airport at
The first lighting used on an airport was during the latter part of
the 1920s; in the 1930s approach lighting came into use. These
indicated the proper direction and angle of descent. The colours and
flash intervals of these lights became standardized under the
International Civil Aviation Organization
World War II
An improvement in the landing field was the introduction of grooves in the concrete surface. These run perpendicular to the direction of the landing aircraft and serve to draw off excess water in rainy conditions that could build up in front of the plane's wheels.
AIRPORT DESIGNATION AND NAMING
Further information: List of airports
Airports are uniquely represented by their IATA airport code and ICAO airport code .
Most airport names include the location. Many airport names honour a
public figure , commonly a politician (e.g. Charles de Gaulle Airport
), a monarch like in
Chhatrapati Shivaji International Airport
Some airports have unofficial names, possibly so widely circulated that its official name is little used or even known.
Some airport names include the word "International" to indicate their
ability to handle international air traffic . This includes some
airports that do not have scheduled airline services (e.g. Albany
Airport security normally requires baggage checks, metal screenings
of individual persons, and rules against any object that could be used
as a weapon. Since the September 11, 2001 attacks and the Real ID Act
of 2005, airport security has dramatically increased and got tighter
and stricter then ever before. See also:
AIR TRAFFIC CONTROL
A towered airport has an operating control tower that is responsible for overseeing the safe, orderly, and expeditious flow of air traffic at airports. Aircraft are required to maintain two-way radio communication with air traffic controllers, and to acknowledge and comply with their instructions. Nontowered airport have no operating control tower and therefore two-way radio communications are not required, though it is good operating practice for pilots to transmit their intentions on the airport’s common traffic advisory frequency (CTAF) for the benefit of other aircraft in the area. The CTAF may be a Universal Integrated Community (UNICOM), MULTICOM, Flight Service Station (FSS), or tower frequency.
The majority of the world's airports are non-towered , with no air traffic control presence. However, at particularly busy airports, or airports with other special requirements, there is an air traffic control (ATC) system whereby controllers (usually ground-based) direct aircraft movements via radio or other communications links. This coordinated oversight facilitates safety and speed in complex operations where traffic moves in all three dimensions. Air traffic control responsibilities at airports are usually divided into at least two main areas: _ground_ and _tower_, though a single controller may work both stations. The busiest airports also have _clearance delivery_, _apron control_, and other specialized ATC stations.
Ground Control is responsible for directing all ground traffic in designated "movement areas ", except the traffic on runways. This includes planes, baggage trains, snowplows , grass cutters, fuel trucks, stair trucks, airline food trucks, conveyor belt vehicles and other vehicles. Ground Control will instruct these vehicles on which taxiways to use, which runway they will use (in the case of planes), where they will park, and when it is safe to cross runways. When a plane is ready to takeoff it will stop short of the runway, at which point it will be turned over to Tower Control. After a plane has landed, it will depart the runway and be returned to Ground Control.
Tower Control controls aircraft on the runway and in the controlled airspace immediately surrounding the airport. Tower controllers may use radar to locate an aircraft's position in three-dimensional space, or they may rely on pilot position reports and visual observation. They coordinate the sequencing of aircraft in the traffic pattern and direct aircraft on how to safely join and leave the circuit. Aircraft which are only passing through the airspace must also contact Tower Control in order to be sure that they remain clear of other traffic.
Main article: Airfield traffic pattern
At all airports the use of a traffic pattern (often called a _traffic circuit_ outside the U.S.) is possible. They may help to assure smooth traffic flow between departing and arriving aircraft. There is no technical need within modern aviation for performing this pattern, _provided there is no queue_. And due to the so-called SLOT-times, the overall traffic planning tend to assure landing queues are avoided. If for instance an aircraft approaches runway 17 (which has a heading of approx. 170 degrees) from the north (coming from 360/0 degrees heading towards 180 degrees), the aircraft will land as fast as possible by just turning 10 degrees and follow the glidepath , without orbit the runway for visual reasons, whenever this is possible. For smaller piston engined airplanes at smaller airfields without ILS equipment, things are very different though.
Generally, this pattern is a circuit consisting of five "legs" that form a rectangle (two legs and the runway form one side, with the remaining legs forming three more sides). Each leg is named (see diagram), and ATC directs pilots on how to join and leave the circuit. Traffic patterns are flown at one specific altitude, usually 800 or 1,000 ft (244 or 305 m) above ground level (AGL). Standard traffic patterns are _left-handed_, meaning all turns are made to the left. One of the main reason for this is that pilots sit on the left side of the airplane, and a Left-hand patterns improves their visibility of the airport and pattern. Right-handed patterns do exist, usually because of obstacles such as a mountain , or to reduce noise for local residents. The predetermined circuit helps traffic flow smoothly because all pilots know what to expect, and helps reduce the chance of a mid-air collision .
At extremely large airports, a circuit is in place but not usually used. Rather, aircraft (usually only commercial with long routes) request approach clearance while they are still hours away from the airport, often before they even take off from their departure point. Large airports have a frequency called _Clearance Delivery_ which is used by departing aircraft specifically for this purpose. This then allows aircraft to take the most direct approach path to the runway and land without worrying about interference from other aircraft. While this system keeps the airspace free and is simpler for pilots, it requires detailed knowledge of how aircraft are planning to use the airport ahead of time and is therefore only possible with large commercial airliners on pre-scheduled flights. The system has recently become so advanced that controllers can predict whether an aircraft will be delayed on landing before it even takes off; that aircraft can then be delayed on the ground, rather than wasting expensive fuel waiting in the air.
Standard visual approach slope indicator
There are a number of aids available to pilots, though not all airports are equipped with them. A visual approach slope indicator (VASI) helps pilots fly the approach for landing. Some airports are equipped with a VHF omnidirectional range (VOR) to help pilots find the direction to the airport. VORs are often accompanied by a distance measuring equipment (DME) to determine the distance to the VOR. VORs are also located off airports, where they serve to provide airways for aircraft to navigate upon. In poor weather, pilots will use an instrument landing system (ILS) to find the runway and fly the correct approach, even if they cannot see the ground. The number of instrument approaches based on the use of the Global Positioning System (GPS) is rapidly increasing and may eventually be the primary means for instrument landings.
Larger airports sometimes offer precision approach radar (PAR), but these systems are more common at military air bases than civilian airports. The aircraft's horizontal and vertical movement is tracked via radar, and the controller tells the pilot his position relative to the approach slope . Once the pilots can see the runway lights, they may continue with a visual landing.
Many airports have lighting that help guide planes using the runways and taxiways at night or in rain or fog .
On runways, green lights indicate the beginning of the runway for
landing, while red lights indicate the end of the runway.
Along taxiways, blue lights indicate the taxiway's edge, and some airports have embedded green lights that indicate the centerline.
Both shielded and unshielded cable are listed in the specifications for the power cables on an airport apron ramp.
Planes take-off and land _into_ the wind in order to achieve maximum performance. Because pilots need instantaneous information during landing, a windsock is also kept in view of the runway. Aviation windsocks are made with lightweight material, withstand strong winds and are lit up after dark or in foggy weather. Because visibility of windsocks is limited, often multiple glow-orange windsocks are placed on both sides of the runway.
"FLF Panther " airport crash tender in
Air safety is an important concern in the operation of an airport,
and almost every airfield includes equipment and procedures for
handling emergency situations.
Airport crash tender
Hazards to aircraft include debris, nesting birds , and reduced friction levels due to environmental conditions such as ice , snow , or rain . Part of runway maintenance is airfield rubber removal which helps maintain friction levels. The fields must be kept clear of debris using cleaning equipment so that loose material does not become a projectile and enter an engine duct (see foreign object damage ). In adverse weather conditions, ice and snow clearing equipment can be used to improve traction on the landing strip. For waiting aircraft, equipment is used to spray special deicing fluids on the wings.
Many airports are built near open fields or wetlands . These tend to
attract bird populations, which can pose a hazard to aircraft in the
form of bird strikes .
Some airports are located next to parks, golf courses, or other low-density uses of land. Other airports are located near densely populated urban or suburban areas.
An airport can have areas where collisions between aircraft on the
ground tend to occur. Records are kept of any incursions where
aircraft or vehicles are in an inappropriate location, allowing these
"hot spots" to be identified. These locations then undergo special
attention by transportation authorities (such as the
During the 1980s, a phenomenon known as microburst became a growing concern due to aircraft accidents caused by microburst wind shear , such as Delta Air Lines Flight 191 . Microburst radar was developed as an aid to safety during landing, giving two to five minutes warning to aircraft in the vicinity of the field of a microburst event.
Some airfields now have a special surface known as soft concrete at the end of the runway (stopway or blastpad) that behaves somewhat like styrofoam , bringing the plane to a relatively rapid halt as the material disintegrates. These surfaces are useful when the runway is located next to a body of water or other hazard, and prevent the planes from overrunning the end of the field.
AIRPORT GROUND CREW (GROUND HANDLING)
Most airports have groundcrew handling the loading and unloading of passengers, crew, baggage and other services. Some groundcrew are linked to specific airlines operating at the airport.
Many ground crew at the airport work at the aircraft. A tow tractor pulls the aircraft to one of the airbridges, The ground power unit is plugged in. It keeps the electricity running in the plane when it stands at the terminal. The engines are not working, therefore they do not generate the electricity, as they do in flight. The passengers disembark using the airbridge. Mobile stairs can give the ground crew more access to the aircraft's cabin. There is a cleaning service to clean the aircraft after the aircraft lands. Flight catering provides the food and drinks on flights. A toilet waste truck removes the human waste from the tank which holds the waste from the toilets in the aircraft. A water truck fills the water tanks of the aircraft. A fuel transfer vehicle transfers aviation fuel from fuel tanks underground, to the aircraft tanks. A tractor and its dollies bring in luggage from the terminal to the aircraft. They also carry luggage to the terminal if the aircraft has landed, and is being unloaded. Hi-loaders lift the heavy luggage containers to the gate of the cargo hold. The ground crew push the luggage containers into the hold. If it has landed, they rise, the ground crew push the luggage container on the hi-loader, which carries it down. The luggage container is then pushed on one of the tractors dollies. The conveyor, which is a conveyor belt on a truck, brings in the awkwardly shaped, or late luggage. The airbridge is used again by the new passengers to embark the aircraft. The tow tractor pushes the aircraft away from the terminal to a taxi area. The length of time an aircraft remains on the ground in between consecutive flights is known as "turnaround time". Airlines pay great attention to minimizing turnaround times in an effort to keep aircraft utilization (flying time) high, with times scheduled as low as 25 minutes for jet aircraft operated by low-cost carriers on narrow-body aircraft.
ENVIRONMENTAL CONCERNS AND SUSTAINABILITY
Aircraft noise is a major cause of noise disturbance to residents living near airports. Sleep can be affected if the airports operate night and early morning flights. Aircraft noise not only occurs from take-off and landings, but also ground operations including maintenance and testing of aircraft. Noise can have other noise health effects . Other noise and environmental concerns are vehicle traffic causing noise and pollution on roads leading the airport.
The construction of new airports or addition of runways to existing airports, is often resisted by local residents because of the effect on countryside, historical sites, local flora and fauna . Due to the risk of collision between birds and aircraft, large airports undertake population control programs where they frighten or shoot birds.
The construction of airports has been known to change local weather patterns. For example, because they often flatten out large areas, they can be susceptible to fog in areas where fog rarely forms. In addition, they generally replace trees and grass with pavement, they often change drainage patterns in agricultural areas, leading to more flooding , run-off and erosion in the surrounding land.
Some of the airport administrations prepare and publish annual environmental reports in order to show how they consider these environmental concerns in airport management issues and how they protect environment from airport operations. These reports contain all environmental protection measures performed by airport administration in terms of water, air, soil and noise pollution, resource conservation and protection of natural life around the airport.
The world's first airport to be fully powered by solar energy is located at Kochi , India. Another airport known for considering environmental parameters is the Seymour Airport at Galapagos Islands.
An airbase, sometimes referred to as an _air station_ or _airfield_,
provides basing and support of military aircraft . Some airbases,
known as _military airports_, provide facilities similar to their
civilian counterparts. For example,
RAF Brize Norton
An aircraft carrier is a warship that functions as a mobile airbase. Aircraft carriers allow a naval force to project air power without having to depend on local bases for land-based aircraft. After their development in World War I, aircraft carriers replaced the battleship as the centrepiece of a modern fleet during World War II.
AIRPORTS IN ENTERTAINMENT
Airports have played major roles in films and television programs due
to their very nature as a transport and international hub, and
sometimes because of distinctive architectural features of particular
airports. One such example of this is _
The Terminal _, a film about a
man who becomes permanently grounded in an airport terminal and must
survive only on the food and shelter provided by the airport. They are
also one of the major elements in movies such as _The V.I.P.s _,
Airplane! _, _
Several computer simulation games put the player in charge of an airport. These include the Airport Tycoon series, simairport And airport ceo.
FILMING AT AIRPORTS
See also: Aircraft spotting
Most airports welcome filming on site, although it must be agreed in advance and may be subject to a fee. Landside, filming can take place in all public areas. However airside, filming is sometimes heavily restricted. To film in an airside location, all visitors must go through security, the same as passengers, and be accompanied by a full airside pass holder and have photographic identification with them at all times. Filming is strictly prohibited in security, immigration/customs and baggage reclaim.
Each national aviation authority has a source of information about airports in their country. This will contain information on airport elevation, airport lighting, runway information, communications facilities and frequencies, hours of operation, nearby NAVAIDs and contact information where prior arrangement for landing is necessary.
Information can be found on-line in the _En route Supplement Australia_ (ERSA) which is published by Airservices Australia , a government owned corporation charged with managing Australian ATC.
Infraero is responsible for the airports in
Two publications, the _
Canada Flight Supplement _ (CFS) and the
The European Organisation for the Safety of Air Navigation (EUROCONTROL) provides an Aeronautical Information Publication (AIP), aeronautical charts and NOTAM services for multiple European countries.
Provided by the Luftfahrt-Bundesamt (Federal Office for Civil Aviation of Germany).
_Aviation Generale Delage_ edited by Delville and published by Breitling.
* The United Kingdom and Ireland
The information is found in Pooley's Flight Guide, a publication compiled with the assistance of the United Kingdom Civil Aviation Authority (CAA). Pooley's also contains information on some continental European airports that are close to Great Britain. National Air Traffic Services , the UK's Air Navigation Service Provider , a public–private partnership also publishes an online AIP for the UK.
* The United States
_Aeronautical Information Publication_ (AIP) is provided by Japan Aeronautical Information Service Center, under the authority of Japan Civil Aviation Bureau , Ministry of Land, Infrastructure, Transport and Tourism of Japan .
* A comprehensive, consumer/business directory of commercial airports in the world (primarily for airports as businesses, rather than for pilots) is organized by the trade group Airports Council International .
* Aviation portal
* ^ Wragg, D.; _Historical dictionary of aviation_, History Press
* ^ "