| Abbreviation | Definition |
|---|---|
| GAL | General Aircraft Ltd |
| GAMI | General Aviation Modifications Inc |
| GANG | Generic Aircraft Nitrogen Generator |
| GAPA | Ground-to-Air Pilotless Aircraft |
| GARB | General Airport Revenue Bonds |
| GARL | Glasgow Airport Rail Link |
| GARS | German Aviation Research Society |
| GASA | General Aviation Safety Assurance |
| GASeP | ICAO Global Aviation Security Plan |
| GASG | Global Aviation and Services Group |
| GASOO | Gulfstream Aviation Safety Oversight Office |
| GASR | Global Aviation Safety Roadmap (International Air Transport Association) |
| GASR | Group of Aerodrome Safety Regulators (Italy) |
| GASU | Garda Air Support Unit |
| GATE | General Aviation Telephonic Entry |
| GATI | Government Aviation Training Institute |
| GATTS | General Aviation Training Testing Service |
| GATU | Galley Auto Transformer Unit |
| GAU | Gun Aircraft Unit |
| GBAA | Georgia Business Aviation Association |