A/C
Aircraft
A/D
Aerodrome
A/P
airplane (US), aeroplane (ICAO)
A/P
Autopilot
AACO
Arab Air Carriers Organisation
AAPA
Association of Asia Pacific Airlines
AASA
Airline Association of Southern Africa
ABTA
Association of British Travel Agents
ACAC
Arab Civil Aviation Commission
ACARS
Aircraft Communications Addressing and Reporting System
ACARS
Aircraft Communication and Addressing Reporting System
ACAS
Airborne Collision Avoidance System
ACAS
Airborne Collision Avoidance System
ACAS
Airborne Collision-Avoidance System (ICAO)
ACC
Active Clearance Control
ACC
Airport Consultative Committee (IATA)
ACFT
Aircraft
ACI
Airports Council International
ACI
Airports Council International
ACMS
Aircraft Condition Monitoring System
ACP
Audio Control Panel
ACS
Audio Control System
AD
Airworthiness Directive
ADAHRS
Air Data and Attitude Heading Reference System
ADC
Air Data Computer
ADC
Air Data Computer
ADF
Automatic Direction Finder
ADF
Automatic Direction Finder
ADI
Attitude Director Indicator
ADI
Attitude Director Indicator
ADIRS
Air Data Inertial Reference System
ADIRU
Air Data Inertial Reference Unit
ADM
Air Data Module
ADS
Either; Automatic Dependant Surveillance or Air Data System
ADS
Automatic Dependent Surveillance
ADS-A
Automatic Dependant Surveillance /Address
ADS-B
Automatic Dependant Surveillance-Broadcast
ADV
German Airports Association
AEA
Association of European Airlines
AECMA
European Association of Aerospace Industries
AFCAC
African Civil Aviation Commission
AFCS
Automatic Flight Control System
AFCS
Automatic Flight Control System
AFD
Autopilot Flight Director
AFDC
Autopilot Flight Director Computer
AFDS
Autopilot Flight Director System
AFDS
Autopilot Flight Director System
AFE
Above Field Elevation
AFIS
Either; Automatic Flight Information Service or Airborne Flight Information System
AFRAA
African Airlines Association
AFS
Aeronautical Fixed Service
AFTN
Aeronautical Fixed Telecommunications Network
AFTN
Aeronautical Fixed Telecommunication Network
AGACS
Automatic Ground-Air Communications System, is also known as ATCSS or data link
AGC
Automatic Gain Control
AGL
Above ground level
AGM
Annual General Meeting (IATA)
AHC
Attitude Heading Control
AHRS
Attitude and Heading Reference Systems
AHRS
Attitude Heading Reference System
AIP
Aeronautical Information Publication
ALC
Automatic Level Control
ALPA
Air Line Pilots Association
ALS
Approach Lighting System
ALT
Either; Altimeter or Altitude
ALT Hold
Altitude Hold Mode
ALTA
Asociación Latinoamericana del Transporte Aéreo
ALTS
Altitude Select
AMLCD
Active Matrix Liquid Crystal Display
AMSL
Above Mean Sea Level
ANC
Active Noise Cancellation
ANN
Annunciator- caution warning system normally containing visual and audio alerts to the pilot
ANR
Active Noise Reduction
ANS
Air Navigation Services
ANSP
Air Navigation Service Provider
ANT
Antenna
AOA
Angle of Attack
AOC
Air Operator's Certificate
AOC
Air Operator's Certificate
AOM
Airport/Aerodrome Operating Minima
AP
Autopilot
APC
Autopilot Computer
API
Advance Passenger Information
APIS
Advance Passenger Information Systems
APS
Autopilot System
APU
Auxiliary Power Unit
APU
Auxiliary Power Unit
AR
Authorization Required
ARINC
Aeronautical Radio, Incorporated (ARINC
ARINC
Aeronautical Radio Inc (US)
ARINC
Aeronautical Radio Inc.
ARTCC
Air Route Traffic Control Centers
ASA
Air Services Agreement
ASAS
Airborne Separation Assurance System
ASD
Aircraft Situation Display
ASDA
Association for Scientific Development of Air Traffic Management in Europe
ASDL
Aeronautical Satellite Data Link
ASEAN
Association of South East Asian Nations
ASECNA
Agence pour la Sécurité de la Navigation Aérienne en Afrique et à Madagascar
ASI
Airspeed Indicator
ASL
Above sea level
ASM
Airspace management
ASO
Agency Services Office
ASPA
Association of South Pacific Airlines
ASR
Airport Surveillance Radar
ASTA
American Society of Travel Agents
ASU
Avionics Switching Unit
AT-One
Strategic Alliance between DLR and NLR on ATM research and development
ATA
Air Traffic Association
ATA
Air Transport Association of America
ATAC
Air Transport Association of Canada
ATAG
Air Transport Action Group
ATB
Air Transport Association of America
ATC
Air Traffic Control
ATC
Air Traffic Control
ATCRBS
Air Traffic Control Radar Beacon System
ATCSS
Air Traffic Control Signaling System
ATFM
Air Traffic Flow Management
ATI
Unit of measure for instrument size, a standard 3¨û cutout is a 3ATI
ATIS
Automatic Terminal Information Service
ATK
Available Tonne Kilometre
ATM
Air Traffic Management
ATM
Air Traffic Management
ATN
Aeronautical Telecommunication Network
ATN
Aeronautical Telecommunication Network
ATNS
Air Traffic and Navigation Services
ATPL
Airline Transport Pilot Licence
ATS
Air Traffic Services
ATS
Air Traffic Services
ATS/DS
Air Traffic Services Direct Speech
ATSP
Air Traffic Service Providers
AUC
Air Transport Users Council
AWB
Air Waybill
AWG
American Wire Gauge
Avionics
Aviation electronics