| 1 | IHC | Iran Helicopter Company | Callsign: Heliran, | IR | AVCODES |
| 2 | IHC | International Harvester | | USA | TRAFFIC |
| 3 | IHCA | INVESTORS HOLDING CO LTD | | | SCAC4 |
| 4 | IHCI | INTERNATIONAL HAZMAT CROSSINGS INC | | | SCAC4 |
| 5 | IHCS | ICE HAWK CORPORATION SA | | | SCAC4 |
| 6 | IHCT | IHC TRANSPORTATION | | | SCAC1 |
| 7 | IHCU | UNASSIGNED | | | PWRC |
| 8 | IHCX | International Harvester Co. | 1/1941-7/1965; eliminated 10/1965 | | NAKINA |
| 9 | IHCX | International Harvester Co. | 1/52-7/65; eliminated 10/65 | | NRHS |
| 10 | IHCX | INTERNATIONAL HARVESTER CO. | | | PWRC |
| 11 | IHCX | International Harvester Co. | | USA | TRAFFIC |
