| Abbreviation | Definition |
|---|---|
| ATPL | Airline Transport Pilot License |
| ATPL | Airline Transport Pilots Licence |
| ATPS | Airline Travel Payments Summit |
| ATPT | Airline Transport Pilot Training |
| ATR | All Terrain Radial tire |
| ATR | Automatic Traffic Recorder |
| ATR | Avions De Transport Regional |
| ATRC | Active Transportation Resource Center |
| ATRC | Androscoggin Transportation Resource Center |
| ATRI | Alliance for Transportation Research Institute |
| ATRS | Air Transport Research Society |
| ATRS | Airline Ticket Reservation System |
| ATS | Advanced Transportation System |
| ATS | Airport Transit System |
| ATS | American Travel Survey |
| ATS | Automatic Train Stop |
| ATS | Automatic Train Supervision |
| ATS | Aviation Technical Services |
| ATSA | Automotive Transportation Supervisors Association |
| ATSB | Air Transportation Stabilization Board |