| 1 | IK | IMAIR Airline | ICAO: ITX, Callsign: Improtex, IATA Prefix: 166, Founded in 1994. Ceased operations on 23 November 2009. | AZ | AVCODES |
| 2 | IK | Tradewinds Airways Ltd. | ICAO: IKA, Callsign: Tradewinds, Ceased operatons 28 Septmber 1990. IATA designator changed from VS | GB | AVCODES |
| 3 | IK | Kaya Airlines L.D.A. | ICAO: KYY, Callsign: Kamoz, Founded 1991 as Transairways. Rebranded as Kaya Airlines and resu,ed operations on 29 August 2011. | MOC | AVCODES |
| 4 | IK | Ikar, LLC | ICAO: KAR, Callsign: Krasjet, IATA Prefix: 770, Founded on 15 June 1993. Name changed to Ikar, LLC t/a Pegas Fly. | RUS | AVCODES |
| 5 | IK | Ikar, LLC t/a Pegas Fly | ICAO: KAR, Callsign: Krasjet, IATA Prefix: 770, Founded on 15 June 1993. IATA designator changed to EO. Name changed from Ikar, LLC. | RUS | AVCODES |
| 6 | IK | Air Kiribati Limited | ICAO: AKL, Callsign: Air Kiribati, Founded on 01 April 1995. | KIR | AVCODES |
| 7 | IK | Ikarusz | | H | TRAFFIC |
| 8 | IKA | Air Company Itek-Air Ltd. | IATA: GI, Callsign: Itek-Air, IATA Prefix: 420, Founded in 1999. Ceased operations in 2010. | KS | AVCODES |
| 9 | IKA | Tradewinds Airways Ltd. | IATA: IK, Callsign: Tradewinds, Ceased operatons 28 Septmber 1990. IATA designator changed from VS | GB | AVCODES |
| 10 | IKA | Gorkha Airlines | IATA: G1, IATA code taken from website not confirmed by IATA | NEP | AVCODES |
| 11 | IKA | Gorkha Airlines | IATA: G1 | | ICAO1 |
| 12 | IKA | Itek Air | IATA: GI | | ICAO1 |
| 13 | IKAG | Iserlohner Kreisbahn AG | City: Iserlohn | D | TRAFFIC |
| 14 | IKAR | IKARUS MARINE LTD | | | SCAC4 |
| 15 | IKASA | Ikasa Railway | Railway operation cancelled, now a bus company. | J | TRAFFIC |
| 16 | IKAT | ICAT LOGISTICS INC | | | SCAC4 |
| 17 | IKB | Ikarbus | | YU | TRAFFIC |
| 18 | IKBL | IKB Leasing SR s.r.o. | | SK | VKM |
| 19 | IKBT | ISKABEL TRANSPORT | | | SCAC4 |
| 20 | IKCU | INTERPOOL | | | PWRC |
| 21 | IKCU | Interpool | | | RSRV |
| 22 | IKCU | KANSAS CITY SOUTHERN TRANSPORT, INC | | | SCAC3 |
| 23 | IKDS | I & K DISTRIBUTORS | | | SCAC4 |
| 24 | IKEK | IKES TRUCKING | | | SCAC4 |
| 25 | IKET | IKE TRANSPORTATION INC | | | SCAC4 |
| 26 | IKGC | INKA GROUP INC | | | SCAC4 |
| 27 | IKK | IKI International Airlines | Callsign: Ikiair, | J | AVCODES |
| 28 | IKK | IKI International Airlines | | | ICAO1 |
| 29 | IKK | Iki International Airline | | J | TRAFFIC |
| 30 | IKKB | Iwata Ken Kotsu Bus | | J | TRAFFIC |
| 31 | IKKU | SEACO SRL | | BDS | BIC |
| 32 | IKKU | ICCU CONTAINERS, INC. | | | PWRC |
| 33 | IKKU | ICCU Containers | | | RSRV |
| 34 | IKKU | SEA CONTAINERS LTD | | | SCAC4 |
| 35 | IKM | Aero Survey Ltd | Callsign: Ghana Survey, ICAO callsign changed to Easy Shuttle | GH | AVCODES |
| 36 | IKM | Aero Survey Ltd | Callsign: Easy Shuttle, Name changed to Aero Survey Ltd t/a Starbow. ICAO callsign changed from Ghana Survey | GH | AVCODES |
| 37 | IKM | Aero Survey Ltd t/a Starbow | IATA: S9, Callsign: Easy Shuttle, IATA Prefix: 759, Name changed from Aero Survey Ltd. ICAO callsign changed from Ghana Survey | GH | AVCODES |
| 38 | IKM | Aero Survey | | | ICAO1 |
| 39 | IKM | Aero Surveys Limited (Starbow Airlines) | | GH | TRAFFIC |
| 40 | IKMC | IKE MANAGEMENT INC | | | SCAC4 |
| 41 | IKMU | LLOYDS MARITIME & TRADING LIMITED | | UAE | BIC |
| 42 | IKMU | LLOYDS MARITIME & TRADING LIMITED | | | SCAC4 |
| 43 | IKN | Ikon GmbH | Callsign: Eekon, | D | AVCODES |
| 44 | IKN | IKON FTO | | | ICAO1 |
| 45 | IKNS | IKON BAJA SA DE CV | | | SCAC4 |
| 46 | IKR | Ikaros DK | Callsign: Ikaros, | DK | AVCODES |
| 47 | IKR | Ikaros DK | | | ICAO1 |
| 48 | IKRO | IKAROS TRANSPORT CORP | | | SCAC4 |
| 49 | IKSU | TRITON CONTAINER INTERNATIONAL LTD | | BM | BIC |
| 50 | IKSU | (REAZ) TRANSAMERICA LEASING, INC. | | | PWRC |
| 51 | IKSU | TAL International | | | RSRV |
| 52 | IKSU | TRANSAMERICA ICS, INC. | | | SCAC3 |
| 53 | IKSU | TRANSAMERICA LEASING INC | | | SCAC4 |
| 54 | IKT | National Aircompany Sakha Avia | IATA: K7, Callsign: Sakha-Avia, IATA Prefix: 840, Designator K7 recalled by IATA | RUS | AVCODES |
| 55 | IKT | National Aircompany Sakha Avia | IATA: K7, Callsign: Sakha-Avia, IATA Prefix: 840, Designator K7 reinstated by IATA | RUS | AVCODES |
| 56 | IKT | National Aircompany Sakha Avia | Callsign: Sakha-Avia, Designator K7 recalled by IATA | RUS | AVCODES |
| 57 | IKTL | I K TRUCKING LLC | | | SCAC4 |
| 58 | IKXS | IKON TRANSPORTATION SERVICES INC | | | SCAC4 |
| 59 | IKY | Intersky Ltd | Callsign: General Sky, Ceased Operations. | BG | AVCODES |
| 60 | IKY | Intersky | | | ICAO1 |
| 61 | IKYT | IKY TRUCKING | | | SCAC4 |
