Abbreviations
| 3GPP | 3rd Generation Partnership Project |
| 4D or 4-D | four dimensional (3D plus time) |
| 5G | fifth generation wireless technology |
| 5GAA | 5G Automotive Association |
| AAM | advanced air mobility |
| AAO | authorized area of operation |
| ABOVs | area based operational volumes |
| ABSAA | airborne sense and avoid |
| ACAS | airborne collision avoidance system |
| ACAS sXu | ACAX Xu for smaller UAS |
| ACAS Xu | airborne collision avoidance system for UAS |
| ACJA | Aerial Connectivity Joint Activity |
| ADS-B | Automatic Dependent Surveillance-Broadcast |
| AFR | autonomous flight rules |
| AGL | above ground level |
| AI | artificial intelligence |
| AIA | Aerospace Industries Association |
| AIS | aeronautical information services |
| AIXM | aeronautical information exchange model |
| AMC ... |
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