| Abbreviation | Definition |
|---|---|
| AMS | Aviation Management System |
| AMSAC | Air Medical Safety Advisory Council |
| AMSI | Arctic Maritime Safety Information |
| AMSS | Aeronautical Mobile Satellite Service |
| AMTCS | Advanced Mobile Traffic Information and Communication System |
| AMTRACK | National Railroad Passenger Corporation (not an acronym) |
| AMV | American Mockup Vehicle |
| AMVER | Automated Mutual Assistance Vessel Rescue System |
| AMZ | Office of Financial and Budget Services of the Mike Monroney Aeronautical Center |
| ANA | Area Navigation Approach |
| ANA | Program Director for Automation |
| ANB | Aids To Navigation Boat |
| ANC | All National Cargoes |
| ANC | Anchorage International Airport |
| ANCR | Accident Notice and Causal Relationship |
| AND | Associate Administrator for NAS Development |
| ANICS | Alaskan NAS Interfacility Communications System |
| ANN | Program Director for Navigation and Landing |
| ANPRM | Advance Notice of Proposed Rule Making |
| ANR | Advanced Noise Reduction |