| Abbreviation | Definition |
|---|---|
| IAPA | International Airline Passenger Association |
| IAPA | International Airline Passengers Association |
| IAPH | International Association of Ports and Harbors |
| IARC | Individual Aircraft Record Card |
| IAT | Inter Arrival Time |
| IAT | Internal Air Transport |
| IATA | International Air Transport Association |
| IATA | International Airline Transport Association |
| IATCI | Inter Airline Through Check In |
| IATD | Intra Alberta Transportation Deduction |
| IATF | International Airline Training Fund |
| IATI | International Air Travel Index |
| IATV | Intelligent Autonomous Transport Vehicle |
| IAV | Intelligent Autonomous Vehicles |
| IAV | Interim Armored Vehicle |
| IAV | International Armoured Vehicles |
| IAWD | Intelligent All Wheel Drive |
| IAWT | Industrial Aerodynamics Wind Tunnel |
| IB | In Bound |
| IBA | Independent Brake Application |