| Abbreviation | Definition |
|---|---|
| ATO | Automatic Transmission Out |
| ATOL | Air Travel Organiser Licensing |
| ATOL | Air Travel Organisers' Licensing |
| ATOL | Air Travel Organizers' Licensing |
| ATOMS | Air Traffic Operations Management System |
| ATON | Aids To Navigation |
| ATOP | Advanced Technologies for Oceanic Procedures |
| ATOP | Airline Training Orientation Program |
| ATOS | Air Transportation Oversight System |
| ATOS | Autonomous Transportation Open Standards |
| ATP | Accorde Transports Perissable |
| ATP | Active Transportation Program |
| ATP | Air Tunnel Purification |
| ATP | Airline Transport Pilot |
| ATP | Airline Transport Pilots |
| ATP | Automatic Train Protection |
| ATPA | Alabama Transportation Planners Association |
| ATPAC | Air Traffic Procedures Advisory Committee |
| ATPCO | Airline Tariff Publishing Company |
| ATPL | Airline Transport Pilot Licence |