| ICAO | IATA | NAME |
|---|
| CSQ | II | IBC Airways |
| IBE | IB | Iberia Airlines |
| IBR | | Ibertour Servicios Aereos |
| IBT | | Ibertrans Aerea |
| IWD | TY | Iberworld |
| IBX | FW | Ibex Airlines |
| IBC | | Ibicenca Air |
| AKI | | Ibk-Petra |
| IBL | | IBL Aviation |
| BBL | | IBM Euroflight Operations |
| YYY | | ICAO |
| RAC | | Icar Air |
| C3 | ICAR Airlines |
| FRC | | Icare Franche Compte |
| ICD | | Icaro |
| ICA | | Icaro |
| IUS | | Icarus |
| CIC | | ICC Canada |
| ICB | | Icebird Airline |
| ICJ | | Icejet |
| ICE | FI | Icelandair |
| ICG | | Icelandic Coast Guard |
| IDG | | IDG Technology Air |
| IFL | | IFL Group |
| RDE | | II Lione Alato Arl |
| IJM | | IJM International Jet Management |
| IKR | | Ikaros DK |
| IKK | | IKI International Airlines |
| IKN | | IKON FTO |
| CIO | | Il Ciocco International Travel Service |
| ILV | | Il-Avia |
| IDL | | Ildefonso Redriguez |
| IAR | | Iliamna Air Taxi |
| ILP | | Ilpo Aruba Cargo |
| ILL | | Ilyich-Avia |
| IMR | | Imaer |
| ITX | IK | Imair Airlines |
| BLU | | IMP Aviation Services |
| XGG | | IMP Group Aviation Services |
| PNX | | Imperial Airways |
| IMT | | Imtrec Aviation |
| IDE | DH | Independence Air |
| IDP | | Independent Air Freighters |
| IIL | | India International Airways |
| IFC | | Indian Air Force |
| IAC | IC | Indian Airlines |
| IDR | | Indicator Company |
| IBU | I9 | Indigo |
| IGO | 6E | IndiGo Airlines |
| IDA | | Indonesia Air Transport |
| AWQ | QZ | Indonesia AirAsia |
| IAA | IO | Indonesian Airlines |
| IPN | | Industri Pesawat Terbang Nusantara |
| ITN | | Industrias Titan |
| 1F | INFINI Travel Information |
| FFI | | Infinit Air |
| INS | | Inflite The Jet Centre |
| IVA | | Innotech Aviation |
| INC | | Insel Air International |
| ICC | | Instituto Cartografico de Cataluna |
| INT | | Intair |
| INL | | Intal Avia |
| FFL | | Intavia Limited |
| IJT | IJ | InteliJet Airways |
| XRA | | Intensive Air |
| ITW | | Inter Air |
| INX | | Inter Express |
| IIN | H4 | Inter Islands Airlines |
| CAR | | Inter RCA |
| NTT | | Inter Tropic Airlines |
| ITA | | Inter-Air |
| ICN | | Inter-Canadian |
| UGL | | Inter-Island Air |
| IMA | | Inter-Mountain Airways |
| ITS | | Inter-State Aviation |
| ILN | D6 | Interair South Africa |
| NTE | | Interaire |
| SUW | ZA | Interavia Airlines |
| IVT | | Interaviatrans |
| ICT | RS | Intercontinental de Aviación |
| ICP | | Intercopters |
| IFT | | Interflight |
| IJT | | Interflight (Learjet) |
| RFL | | Interfly |
| IFF | | Interfreight Forwarding |
| IGN | | Interguide Air |
| ISN | | Interisland Airlines |
| IWY | | Interisland Airways Limited |
| MTF | | Interjet |
| IHE | | Interjet Helicopters |
| ITK | ID | Interlink Airlines |
| IAK | | International Air Cargo Corporation |
| ITC | | International Air Carrier Association |
| EXX | | International Air Corporation |
| IAS | | International Air Service |
| IAX | | International Air Services |
| IBZ | 6I | International Business Air |
| IBY | | International Business Aircraft |
| ICS | | International Charter Services |
| ICX | | International Charter Xpress |
| RED | | International Committee of the Red Cross |
| IIG | | International Company for Transport, Trade and Pub |
| IFX | | International Flight Training Academy |
| IJA | | International Jet Aviation Services |
| HSP | | International Jet Charter |
| ISF | | International Sabilisation Assistance Force |
| THN | | International Security Assistance Force |
| RSQ | | International SOS WIndhoek |
| ITH | | International Trans-Air |
| IPT | | Interport Corporation |
| IKY | | Intersky |
| ISK | | Intersky Luftfahrt |
| FWA | I4 | Interstate Airline |
| ITU | | Intervuelos |
| INV | | Inversija |
| IND | | Iona National Airways |
| IOA | | Iowa Airways |
| IPA | | IPEC Aviation |
| IPM | | IPM Europe |
| IRA | IR | Iran Air |
| IRC | EP | Iran Aseman Airlines |
| IRB | | Iranair Tours |
| IAW | IA | Iraqi Airways |
| BIS | | Irbis Air |
| IRL | | Irish Air Corps |
| RDK | | Irish Air Transport |
| XMR | | Irish Aviation Authority |
| LVB | | IRS Airlines |
| IRT | IT | Irtysh Airlines |
| XIA | | Irving Oil |
| KCE | | Irving Oil Transport |
| ISD | | ISD Avia |
| ISI | | Island Air |
| ILF | | Island Air Charters |
| XYZ | | Island Air Express |
| IS | Island Airlines |
| SOY | | Island Aviation |
| IOM | | Island Aviation and Travel |
| DQA | | Island Aviation Services |
| SDY | 2S | Island Express |
| MTP | | Island Helicopters |
| ILC | | Island Link |
| IAJ | | Islandair Jersey |
| CN | Islands Nationair |
| ISW | IF | Islas Airways |
| IGS | | Isle Grande Flying School |
| ISV | WC | Islena De Inversiones |
| IOS | | Isles of Scilly Skybus |
| IAI | | Israel Aircraft Industries |
| IAF | | Israeli Air Force |
| ISR | 6H | Israir |
| IST | | Istanbul Airlines |
| 1U | ITA Software |
| ACL | 9X | Itali Airlines |
| IFS | | Italy First |
| IKA | GI | Itek Air |
| IVS | | Ivoire Aero Services |
| IVW | | Ivoire Airways |
| IJE | | Ivoire Jet Express |
| FDF | | IVV Femida |
| OIC | | Iwamoto Crane Co Ltd |
| IXR | | Ixair |
| IZM | H9 | Izair |
| IZA | | Izhavia |
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