| Acronym |
Definition |
| AAL |
Above Aerodrome Level. |
| ABM |
Abeam |
| A/C |
Aircraft. |
| ACARS |
Aircraft Communication Addressing and Reporting System. |
| ACC |
Area Control Center. |
| ACZ |
Aerodrome Control Zone. |
| AD |
Airworthiness Directive,. |
| ADF |
Automatic Direction Finder. |
| ADI |
Attitude Deviation Indicator. |
| ADIZ |
Air Defense Identification Zone. |
| ADR |
Accident Data Recorder. |
| ADS |
Automatic Dependence Surveillance |
| AEF |
Aerodromes Environmental Federation. |
| AERAD |
UK-published flight guide and navigational chart system. |
| AFB |
Air Force Base, usually U.S. or Canadian. |
| AFCS |
Automatic Flight Control System |
| AFI |
Assistant Flying Instructor. |
| AFIC |
Assistant Flying Instructor Course. |
| AFIS |
Aerodrome Flight Information Service. |
| AFTN |
Aeronautical Fixed Telecommunications Network. |
| AGL |
Above Ground Level. |
| AHRS |
Attitude-Heading Reference System. |
| AIAA |
Area of Intense Aerial Activity, usually military. |
| AIP |
Aeronautical Information Publication. |
| AIREP |
form for reporting position and Met conditions in flight. |
| AIS |
Aeronautical Information Service. |
| AIZ |
Aerodrome Information Zone. |
| AME |
authorized medical examiner. |
| AMSL |
Above Mean Sea Level. |
| AOA |
Alpha/angle of Attack. |
| AOA |
Airport Operators' Association. |
| AOC |
Air Operator's Certificate, |
| AoE |
Airport of Entry (USA). |
| AOG |
Aircraft on Ground,. |
| AOPA |
Aircraft Owners and Pilots Association. |
| A/P |
Airport or Autopilot. |
| A & P |
Airframe and Powerplant Mechanic (USA). |
| APA |
Aerodromes Protection Agency. |
| APHAZ |
Aircraft Proximity Hazards Assessment Panel. |
| APP |
Approach (control). |
| APU |
Auxiliary Power Unit. |
| ARB |
Airworthiness Review Board. |
| ARCAL |
Aircraft Radio Control of Aerodrome Lighting. |
| ARESTI |
key shorthand notation system devised by Spaniard José L Aresti. |
| ARINC |
Aeronautical Radio Incorporated. |
| ARP |
Aerodrome Reference Point. |
| ASDA |
Accelerate-Stop Distance Available. |
| ASI |
Airspeed Indicator. |
| ASR |
Altimeter Setting Region. |
| ASR |
Airport Surveillance Radar |
| ASR |
Air-Sea Rescue. |
| ATA |
Actual Time of Arrival. |
| ATA |
Air Training Association. |
| ATC |
Air Traffic Control. |
| ATCO |
Air Traffic Control Officer. |
| ATCA |
Air Traffic Control Assistant. |
| ATCC |
Air Traffic Control Centre. |
| ATIS |
Automatic Terminal Information Service. |
| ATPL |
Air Transport Pilot Licence. |
| ATS |
Air Traffic Service. |
| ATSU |
ATS Unit. |
| ATSORA |
Air Traffic Services Outside Regulated Airspace. |
| ATZ |
Aerodrome Traffic Zone. |
| AVTUR |
Aviation Turbine Fuel. |
