| A/C |
Aircraft |
| A/FD |
Airport/Facilities Directory (NACO) |
| A/G |
Air-to-Ground |
| A/TA |
Airlift/Tanker Association |
| AAAE |
American Association of Airport Executives |
| AAC |
Advanced Airspace Concept (NASA) |
| AAR |
Airport Acceptance Rate |
| AAR |
Air-to-Air Refueling |
| AATF |
Airport and Airway Trust Fund (FAA) |
| AATT |
Advanced Air Transportation Technologies (NASA) |
| ABESS |
Airline-based En Route Sequencing and Spacing |
| AC |
Aircraft |
| ACAS |
Airborne Collision Avoidance System |
| ACC |
Airport Consultants Council |
| ACD |
Automatic Conflict Detection |
| A-CDA |
Advanced-Continuous Descent Approach |
| A-CDM |
Advanced-Collaborative Decision-Making |
| ACF |
Area Control Facility |
| ACI |
Aeronautical Communication International |
| ACI |
Airports Council International |
| ACI-NA |
Airport Council International-North America |
| ACIP |
Aviation System Capital Investment Plan |
| ACM |
Airborne Conflict Management |
| ACP |
ARTS Common Processor |
| ACSS |
Aviation Communication & Surveillance Systems |
| ACTD |
Advanced Concept Technology Demonstration |
| ADAP |
Airport Development Aid Program |
| ADAPT |
Automatic Detection and Processing Terminal |
| ADC |
Air Defense Command |
| ADDS |
Aviation Digital Data Service |
| ADG |
Accommodation Drafting Group (Aeronautical Telecommunication Network) |
| ADIZ |
Air Defense Identification Zone |
| ADL |
Aeronautical Data-Link |
| ADS |
Air Defense Sectors (USAF) (NDP) |
| ADS-B |
Automatic Dependent Surveillance-Broadcast |
| AEDT |
Aviation Environmental Design Tool |
| AF |
Air Force |
| AFB |
Air Force Base |
| AFC |
Advanced Flight Controls |
| AFD |
Airline Flight Dispatcher |
| AFIS |
Automated Flight Inspection System |
| AFM |
Airspace Flow Management |
| AFP |
Airspace Flow Program |
| AFSS |
Automated Flight Service Station |
| AFSSVS |
AFSS Voice Switch |
| AFTN |
Aeronautical Fixed Telecommunication Network |
| AFWA |
Air Force Weather Agency |
| AGATE |
Advanced General Aviation Transport Experiments (NASA) |
| AGFS |
Aviation Gridded Forecast System |
| AIA |
Aerospace Industries Association |
| AIAA |
American Institute of Aeronautics and Astronautics |
| AIDAP |
Aeronautical Integrated Data Access Portal (eNOTAMS) |
| AIDS |
Accident/Incident Data System |
| AIM |
Aeronautical Information Management |
| AIP |
Airport Improvement Program (FAA) |
| AIPA |
Aeronautical Information Production Automation |
| AIRE |
Atlantic Interoperability Initiative to Reduce Emissions |
| AIRMET |
Airmen’s Meteorological Information |
| AIRNAV |
Air Navigation |
| AIS |
Aeronautical Information Services |
| AIS |
Aeronautical Information System |
| ALPA |
Air Line Pilots Association |
| ALS |
Approach Lighting System |
| AMASS |
Airport Movement Area Safety System |
| AMC |
Air Mobility Command (USAF) |
| AMOS |
Automatic Meteorological Observing Systems |
| AMP |
Airspace Management Program |
| AMS |
American Meteorological Society |
| AMS |
Arrival Metering and Sequencing |
| AMSTAR |
Airborne Merging and Spacing for Terminal Arrivals |
| ANICS |
Alaska NAS Interfacility Communications System |
| ANSP |
Air Navigation Service Provider |
| AO |
Airline Operations |
| AO |
Airport Operator |
| AOC |
Advanced Operational Capability |
| AOC |
Airport Operations Center |
| AOPA |
Aircraft Owners and Pilots Association |
| APA |
Allied Pilots Association |
| APG |
Aircraft Performance Group |
| APMT |
Aviation Portfolio Management Tool (Environment) |
| APTS |
Automated Procedures Tracking System (IAPA) |
| AR |
Aerial Refueling |
| ARC |
Ames Research Center (NASA) |
| ARC |
Aviation Rulemaking Committee |
| ARMD |
Aeronautics Research Mission Directorate (NASA) |
| ARSR |
Air Route Surveillance Radar |
| ARTCC |
Air Route Traffic Control Center |
| ARTS |
Automated Radar Terminal System |
| ASAP |
Aviation Safety Action Programs |
| ASAS |
Aviation Safety Analysis System |
| ASCII |
American Standard Code for Information Interchange |
| ASD |
Aircraft Situational Display |
| ASDE |
Airport Surface Detection Equipment |
| ASDI |
Aircraft Situation Display to Industry |
| ASIAS |
Aviation Safety Information Analysis and Sharing (formerly known as NASDAC) |
| ASOS |
Automated Surface Observing System |
| ASP |
Airspace Systems Program (NASA) |
| ASP |
Aviation Safety Program (FAA) |
| ASPIRE |
Asia and South Pacific Initiative to Reduce Emissions |
| ASR |
Airport Surveillance Radar |
| ASRS |
Aviation Safety Reporting System |
| ASSP |
Aviation Safety Strategic (National) Plan |
| AST |
Office of Commercial Space Transportation (FAA) |
| ATA |
Air Transport Association |
| ATAAS |
Advanced Terminal Area Approach Spacing (NASA) |
| ATC |
Air Traffic Control |
| ATCA |
Air Traffic Control Association |
| ATCBI |
Air Traffic Control Beacon Indicator |
| ATCRB |
Air Traffic Control Radar Beacon |
| ATCSCC |
Air Traffic Control Systems Command Center |
| ATCT |
Airport Traffic Control Tower |
| ATFM |
Air Traffic Flow Management |
| ATIS |
Automated Terminal Information Service |
| ATM |
Air Traffic Management |
| ATO |
Air Traffic Operations |
| ATO |
Air Traffic Organization (FAA) |
| ATOS |
Air Transportation Oversight System (FAA) |
| ATPAC |
Air Traffic Procedures Advisory Committee |
| ATS |
Air Traffic Services |
| ATS |
Air Transportation System |
| AVID |
Airspace Visual Display |
| AVN |
Aviation Forecast Weather Model data (NCEP) |
| AVS |
Office of Aviation Safety (FAA) |
| AVT |
Automated Virtual Tower |
| AWC |
Aviation Weather Center |
| AWIN |
Aviation Weather Information |
| AWIPS |
Advanced Weather Information Processing System (NWS) |
| AWIS |
Automatic Weather Information System (ATCT and TRACON) |
| AWN |
Automated Weather Network |
| AWOS |
Automated Weather Observing System |
| AWP |
Aviation Weather Processor (M1FC system and WMSCR @ NNCCs) |
| AWR |
Aviation Weather Research |