AAR or Aar may refer to:

Aviation

AAR Corporation AAR Corp. is an American provider of aircraft maintenance services to commercial and government customers worldwide. The company is headquartered in Wood Dale, Illinois, a Chicago suburb. The company employs about 6,000 people, operating in abo ...

, an American aviation engineering company *

Air-to-air refueling Aerial refueling ( en-us), or aerial refuelling ( en-gb), 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 an ...

, the process of transferring aviation fuel from one military aircraft to another during flight * IATA airport code for

Aarhus Airport Aarhus Airport is an international airport located northeast of Aarhus, Denmark. History The airfield was established in 1943 by German occupying forces in World War II and was later used as a Cold War military base for the Danish and other ...

in Mid Jutland Region, Denmark * ICAO airline code for

Asiana Airlines Asiana Airlines Inc. ( ) is a South Korean airline headquartered in Seoul.Home
." Asiana Airlines. Retrieved 13 September 2 ...

of South Korea

Geography

Aar The Aare () or Aar () is the main tributary of the High Rhine (its discharge even exceeds that of the latter at their confluence) and the longest river that both rises and ends entirely within Switzerland. Its total length from its source to i ...

, a river in Switzerland, tributary of the Rhine *

Aar (Lahn) The Aar () is a river of Hesse and Rhineland-Palatinate, in western Germany, left tributary of the Lahn. It rises in the Taunus mountains, near Taunusstein. It flows generally north through the towns Taunusstein, Bad Schwalbach, Aarbergen and ...

, a tributary of Lahn river in Germany, descending from the Taunus mountains *

Aar (Dill) The Aar is a river of Hesse, Germany. It flows for into the Dill from the left bank near Herborn. Tributaries The tributaries of the Aar are as follows: *Brühlsbach (right) - 3.3 km *Stadterbach (left) - 6.6 km *Wilsbach (right) - 6.3 km ...

, a tributary of Dill river in Germany, also in the basin of the Lahn * Aar (Ill), a branch of the Ill river that separates from it in Strasbourg, France and rejoins it further north * Aar (Twiste), a tributary of Twiste river in Germany, in the basin of the Weser * Aar (village), a village in Rajasthan, India * South American–Antarctic Ridge, also known as the American–Antarctic Ridge, a mid-ocean ridge in the South Atlantic *

Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. ...

, IAAF code AAR

Military

* After-action review, a structured review process used by the U.S. military *

After action report An after action report (or AAR) is any form of retrospective analysis on a given sequence of goal-oriented actions previously undertaken, generally by the author themselves. The two principal forms of AARs are the literary AAR, intended for recreat ...

, a retrospective analysis * Assistant Automatic Rifleman, a soldier who carries ammunition, see Rifleman#Modern_tactics.

Organizations

All American Racers All American Racers is an American-licensed auto racing team and constructor based in Santa Ana, California. Founded by Dan Gurney and Carroll Shelby in 1964, All American Racers initially participated in American sports car and Champ Car races ...

, a former Formula 1 and CART team *

Allens (law firm) Allens is an international commercial law firm that operates in the Asia-Pacific region. The firm is one of the largest in the Asia-Pacific region and has many high-profile political, judicial and corporate alumni. It is in an alliance with t ...

, a law firm (formerly known as Allens Arthur Robinson) *

American Academy in Rome The American Academy in Rome is a research and arts institution located on the Gianicolo in Rome, Italy. The academy is a member of the Council of American Overseas Research Centers. History 19th century In 1893, a group of American architect ...

, research and arts institution in Rome *

American Academy of Religion The American Academy of Religion (AAR) is the world's largest association of scholarly method, scholars in the List of academic disciplines, field of religious studies and related topics. It is a nonprofit member association, serving as a profess ...

, an association of academics who research or teach topics related to religion * Association for Automated Reasoning, a non-profit that seeks to advance the field of automated reasoning *

Association of American Railroads The Association of American Railroads (AAR) is an industry trade group representing primarily the major freight Rail transport, railroads of North America (Canada, Mexico and the United States). Amtrak and some regional Commuter rail in North Am ...

, an industry trade group representing the railroads of North America

Transportation

* AAR coupling, railway coupling specification of the Association of American Railroads *

AAR wheel arrangement The AAR wheel arrangement system is a method of classifying locomotive A locomotive is a rail transport, rail vehicle that provides the motive power for a train. Traditionally, locomotives pulled trains from the front. However, Push–pu ...

, Association of American Railroads system for describing wheel arrangement of locomotives *

All-American Road A National Scenic Byway is a road recognized by the United States Department of Transportation for one or more of six "intrinsic qualities": archeological, cultural, historic, natural, recreational, and scenic. The program was established by Co ...

, a designation for some national scenic byways in the United States *

Ann Arbor Railroad (disambiguation) Ann Arbor Railroad may refer to: *Ann Arbor Railroad (1895–1976), one of the bankrupt railroads that was reorganized in 1976 *Ann Arbor Railroad (1988), a shortline railroad that operates the south end of the former Ann Arbor Railroad (1895-1976) ...

Other uses

Aar (Star Wars) ''Star Wars: The Han Solo Trilogy'' is a trilogy of non-canon ('Legends') science-fiction novels set in the ''Star Wars'' galaxy. It follows Han Solo's origins and life before the events depicted in the original ''Star Wars'' trilogy (1977– ...

, fictional planet in ''Star Wars'' universe *Aar, a fictional planet of the star Deneb, in the "

Captain Future Captain Future is a Pulp magazine, pulp science fiction hero – a space-traveling scientist and adventurer – originally published in the United States in Captain Future (magazine), his namesake pulp magazine from 1940 to 1944. The character w ...

" stories *

The All-American Rejects The All-American Rejects (often abbreviated as AAR) are an American rock band formed in Stillwater, Oklahoma, in 1999.Air America Radio Air America (formerly Air America Radio and Air America Media) was an American radio network specializing in progressive talk radio. It was on the air from March 2004 to January 2010. The network was founded as a left–wing alternative to coun ...

, a domestic United States radio network *

Average accounting return The average accounting return (AAR) is the average project earnings after taxes and depreciation, divided by the average book value of the investment during its life. Approach to making capital budgeting decisions involves the average accounting ret ...

, a capital budgeting investment rule *

Adam's apple reduction Chondrolaryngoplasty (commonly called tracheal shave, but this is a misnomer as the trachea is not involved) is a surgical procedure in which the thyroid cartilage is reduced in size by shaving down the cartilage through an incision in the throat ...

, a surgery *

Afar language Afar is an Afroasiatic language belonging to the Cushitic branch, primarily spoken by the Afar people, native to parts of Djibouti, Eritrea and Ethiopia. It is an official language in Ethiopia; and a national language in Djibouti and Eritre ...

(ISO 639 language identification code) *''

African American Review ''African American Review'' is a scholarly aggregation of essays on African-American literature, theatre, film, the visual arts, and culture; interviews; poetry; fiction; and book reviews. It is the official publication of the Modern Language Ass ...