| . abbreviation: ARO
 airport surface detection equipment Radar equipment specifically designed to detect all principal features on the surface of an airport, including aircraft and vehicular traffic, and to present the entire image on a radar indicator console  in the control tower. The equipment is used to augment visual observation by tower personnel of aircraft and/or vehicular movements on runways and taxiways.
 . abbreviation: ASDE
 Fr: radar de surveillance des mouvements de surface
 airport taxi chart
 U.S.: Expression for: taxi chart
 airport traffic area U.S.: Unless otherwise specifically designated in FAR 93, that airspace within a horizontal radius of 5 SM from the geographical center of any airport at which a control tower is operating, extending from the surface up to, but not including, an altitude of 3000 ft above the elevation of an airport.
 air refuelling
 A procedure used by the military to transfer fuel from one aircraft to another during flight.
 .
 abbreviation: AIRFL
 . also called: in-flight refuelling
 Fr: ravitaillement en vol
 air refuelling control point The geographical point over which the receiver arrives in the observation/refuelling position with respect to the assigned tanker.
 . abbreviation: ARCP
 Fr: point de contr.le de ravitaillement en vol
 air refuelling initial point The geographical point at which the receiver aircraft enters the refuelling track, initiates radio contact with the tanker and begins a manoeuvre to rendezvous.
 . abbreviation: ARIP
 Fr: point initial de ravitaillement en vol
 air report A report from an aircraft in flight prepared in conformity with requirements for position and operational and/or meteorological reporting.
 .
 abbreviation: AIREP
 . also called: in-flight report
 Fr: compte rendu en vol
 air route The uncontrolled airspace within the boundaries or along the tracks specified on an aeronautical chart, or the controlled airspace within the boundaries or along the tracks specified in the Designated Airspace Handbook (DAH). Fr: route aérienne
 air route surveillance radar U.S.: An air route traffic control center (ARTCC) radar used primarily to detect and display an aircraft’s position while en route between terminal areas. The ARSR enables controllers to provide radar ATC service when aircraft are within the ARSR coverage. In some instances, ARSR may enable an ARTCC to provide terminal radar services similar to but usually more limited than those provided by a radar approach control.
 . abbreviation: ARSR
 air route traffic control center U.S.: A facility established to provide ATC service to aircraft operating on IFR flight plans (FP) within controlled airspace and principally during the en route phase of flight. When equipment capabilities and controller workload permit, certain advisory/assistance services may be provided to VFR aircraft.
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