| 1 | IMI | Imperial Aerotransporte, S.A. de C.V. | Callsign: Imperialaereo, | MEX | AVCODES |
| 2 | IMID | Indiana Midland Ry. | added 4/1985; eliminated 1/1988 | | NAKINA |
| 3 | IMID | Indiana Midland Ry. | added 4/85; eliminated 1/88 | | NRHS |
| 4 | IMID | INDIANA MIDLAND CO. (CODE SUSPENDED 7/27/87) | | | PWRC |
| 5 | IMIM | IMI MANUFACTURING DE MEXICO SA DE C | | | SCAC4 |
| 6 | IMIN | INTERNATIONAL MARITIME INC | | | SCAC4 |
| 7 | IMIP | IMI DEL PERU SAC | | | SCAC4 |
| 8 | IMIQ | IMASCO MINERALS INC | | | SCAC4 |
| 9 | IMIU | SULLAIR ARGENTINA S.A. | | RA | BIC |
