| Abbreviation | Definition |
|---|---|
| HT | High Thrust |
| HUD | Head-up Display |
| HULA | Hybrid Ultra Large Aircraft |
| HVAR | High Velocity Aircraft Rocket |
| HVDC | High Voltage Direct Current |
| HX | Hong Kong Airlines |
| I&R | Interchangeable and Replaceable |
| I/R | Interchange/Replacement |
| IAA | Irish Aviation Authority |
| IAAA | Idaho Agricultural Aviation Association |
| IAAA | Illinois Agricultural Aviation Association |
| IAAA | Incheon Airport Aviation Academy |
| IAAA | International Aviation Academy of Australia |
| IAAA | Iowa Agricultural Aviation Association |
| IAAM | Integrated Advacned Aviation Meteorological |
| IAB | International Aviation Business |
| IACAC | International Association of Civil Aviation Chaplains (Germany) |
| IACRA | Integrated Airman Certification and Rating Application |
| IADF | International Aircraft Development Fund |
| IAFS | International Aviation Forecast Summit |