| Abbreviation | Definition |
|---|---|
| ATO | Air Traffic Operations |
| ATO | Air Traffic Organisation |
| ATO | Airport Ticketing Office |
| ATO | Aviation Training Organization |
| ATOC | Air Terminal Operations Center |
| ATOS | Air Transportation Oversight Stystem |
| ATP | Airline Transport Pilot |
| ATP | Alert Transponder Panel |
| ATR | Accumulated Time Record |
| ATR | Auto Transformer Rectifier |
| ATR | Aviation Training Relocation |
| ATRU | Auto Transformer Rectifier Unit |
| ATRUC | Auto Transformer Rectifier Unit Contactor |
| ATS | Air Traffic Services |
| ATS | Air Turbine Starter |
| ATS | Auto-Thrust System |
| ATSA | Aviation and Transportation Security Act |
| ATSP | Air Traffic Service Provider |
| ATSU | Air Traffic Services Unit |
| ATT | Attitude |