| Abbreviation | Definition |
|---|---|
| IEPB | Integrated Electric Parking Brake |
| IEV | Industrial Electric Vehicle |
| IEV | Intelligent Electric Vehicles |
| IF | Intermediate Fix |
| IFB | Interruptable Fold Back |
| IFCN | Inter-Facility Flow Control Network |
| IFEA | In-Flight Emergency Assistance |
| IFEN | In Flight Entertainment Network |
| IFFA | International Freight Forwarding Association |
| IFM | Interoperable Fare Management |
| IFMS | Interagency Fleet Management System |
| IFO | Indoor Flying Object |
| IFR | I Follow Roads |
| IFR | Instructional Flight Regulations |
| IFR | Interim Final Rule |
| IFS | Inflight Survey |
| IFS | Inland Freight Station |
| IFSS | International Flight Service Station |
| IFT | International Forwarding And Transport |
| IFTA | International Fuel Tax Agreement |