Acronyms
| ACAS /TCAS | Airborne or Traffic Collision Avoidance System. These will have a further descriptor of 'RA' - Resolution Advisory or 'TA' - Traffic Advisory |
| ADS-B/C | Automatic Dependent Surveillance - Broadcast / Contract |
| AGL | Above Ground Level |
| AHRS | Attitude & Heading Reference System |
| AMSL | Above Mean Sea Level |
| APU | Auxiliary Power Unit |
| ATC | Air Traffic Control |
| ATIS |