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"A" Terms and Definitions
| 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 center |
| 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 |