| 1 | IMS | Air Images | Callsign: Images, | GB | AVCODES |
| 2 | IMSAT | IMSAT SA | | RO | VKM |
| 3 | IMSD | IINO MARINE SERVICE CO LTD | | | SCAC4 |
| 4 | IMSE | Impresa Salvatore Esposito | | I | TRAFFIC |
| 5 | IMSF | ISLAND MARITIME SERVICES INC | | | SCAC4 |
| 6 | IMSG | IMT-SHIPPING & CHARTERING GMBH | | | SCAC4 |
| 7 | IMSI | IMPORTACIONES RARAMURI | | | SCAC4 |
| 8 | IMSJ | IRVINE, MICHAEL STUDIOS INC | | | SCAC4 |
| 9 | IMSN | IMS OF WESTERN NY | | | SCAC4 |
| 10 | IMSP | INTERNATIONAL MOTOR SPORTS ASSOCIAT | | | SCAC4 |
| 11 | IMSQ | I M E E S A | | | SCAC4 |
| 12 | IMSR | INTEGRATED MARINE SERVICES LLC | | | SCAC4 |
| 13 | IMSU | IMMOBILIARE STELLA SRL | | I | BIC |
| 14 | IMSU | IMMOBILIARE STELLA SRL | | | SCAC4 |
| 15 | IMSV | INTERNATIONAL MOVING SERVICE (I M S | | | SCAC4 |
| 16 | IMSW | INVENTORY MANAGEMENT SERVICES LLC | | | SCAC4 |
| 17 | IMSX | IMCO Services, a Division of Halliburton Co. | added 1/1982; eliminated 1/1986 | | NAKINA |
| 18 | IMSX | IMCO Services, a Division of Halliburton Co. | added 1/82; eliminated 1/86 | | NRHS |
| 19 | IMSX | *IMCO SERVICES, DIV. OF HALLIBURTON CO. | | | PWRC |
| 20 | IMSX | *INTERNATIONAL MILL SERVICE | | | PWRC |
| 21 | IMSX | IMCO Services (International Mill Service) | | | RSRV |
| 22 | IMSY | INTELLIGENT IMAGING SYSTEMS INC | | | SCAC4 |
| 23 | IMSZ | INTERMODAL SYSTEMS, INC. | | | PWRC |
| 24 | IMSZ | Intermodal Systems | | | RSRV |
| 25 | IMSZ | INTERMODAL SYSTEMS, INC. | | | SCAC4 |
