Airlines — I
- IAXInternational Air Services
- IBZInternational Business Air
- IBYInternational Business Aircraft
- ICSInternational Charter Services
- ICXInternational Charter Xpress
- REDInternational Committee of the Red Cross
- IIGInternational Company for Transport
- INEInternational Europe
- IFXInternational Flight Training Academy
- IJAInternational Jet Aviation Services
- HSPInternational Jet Charter
- ISFInternational Sabilisation Assistance Force
- THNInternational Security Assistance Force
- RSQInternational SOS WIndhoek
- ITHInternational Trans-Air
- IPTInterport Corporation
- IKYIntersky
- FWAInterstate Airline
- ITUIntervuelos
- INVInversija
- INDIona National Airways
- IOAIowa Airways
- IPAIPEC Aviation
- IPMIPM Europe
- IRAIran Air
- IRCIran Aseman Airlines
- IRBIranair Tours
- IAWIraqi Airways
- BISIrbis Air
- IRLIrish Air Corps
- RDKIrish Air Transport
- XMRIrish Aviation Authority
- LVBIRS Airlines
- IRTIrtysh Airlines
- XIAIrving Oil
- KCEIrving Oil Transport
- ISDISD Avia
- ISIIsland Air
- MKUIsland Air (WP)
- ILFIsland Air Charters
- XYZIsland Air Express
- SOYIsland Aviation
- IOMIsland Aviation and Travel
- DQAIsland Aviation Services
- SDYIsland Express
- MTPIsland Helicopters
- ILCIsland Link
- ISXIsland Spirit
- IAJIslandair Jersey
- ISWIslas Airways
- IGSIsle Grande Flying School
- ISVIslena De Inversiones
- IOSIsles of Scilly Skybus
- IAIIsrael Aircraft Industries
- IAFIsraeli Air Force
- ISRIsrair
- ISTIstanbul Airlines
- ACLItali Airlines
- IFSItaly First
- IKAItek Air
- IVSIvoire Aero Services
- IVWIvoire Airways
- IJEIvoire Jet Express
- FDFIVV Femida
- OICIwamoto Crane Co Ltd
- IXRIxair
- IZMIzair
- IZAIzhavia