| Abbreviation | Definition |
|---|---|
| IFR | In Flight Refueling |
| IFR | Instrument Flight Rule |
| IFR | Instrument Flight Rules |
| IGAF | International General Aviation Forum |
| IGB | Intermediate Gear Box (see SAGB) |
| IGV | Inlet Guide Vane |
| IIAE | Indian Institute Of Aircraft Engineering |
| IJAM | International Journal of Aviation Management |
| IJNA | Imperial Japanese Naval Aviation |
| IKIA | Imam Khomaini International Airport |
| ILAS | Irish Light Aviation Society |
| ILS | Instrument Landing System |
| IMC | Instrument Meteorological Conditions |
| IMU | Inertial Measurement Unit |
| IN | Inch or Inches |
| INFO | Information |
| INR | Integrated Naviation Radio |
| INVOF | IN Vicinity OF |
| IP | Initial Point |
| IP8 | Intermediate Pressure Compressor (Stage 8) |