| 1 | FCI | Air Carriers, Inc. | Callsign: Fast Check, | USA | AVCODES |
| 2 | FCI | Air Carriers | | | ICAO1 |
| 3 | FCI | Ferrocarril Interoceánico de México | | MEX | TRAFFIC |
| 4 | FCIB | FTAC INC | | | SCAC4 |
| 5 | FCID | FREIGHT CONTRACTORS INC | | | SCAC4 |
| 6 | FCIH | FACTORY CONNECTION INC | | | SCAC4 |
| 7 | FCIJ | F C I TRANSPORT INC | | | SCAC3 |
| 8 | FCIK | FLASH CARGO INC | | | SCAC4 |
| 9 | FCIM | FIRST COAST INTERMODAL SERVICES INC | | | SCAC3 |
| 10 | FCIN | Frankfort & Cincinnati R.R. Co. | 1/1975-1/1980; eliminated 4/1986 | | NAKINA |
| 11 | FCIN | Frankfort & Cincinnati R.R. Co. | 1/75-1/80; eliminated 4/86 | | NRHS |
| 12 | FCIN | FRANKFORT AND CINCINNATI RAILROAD | | | PWRC |
| 13 | FCIN | FRANKFORT & CINCINNATI RAILROAD CO. | | | PWRC |
| 14 | FCIN | Frankfort and Cincinnati Railroad | | | RSRV |
| 15 | FCIO | FIRST COAST INTERMODAL INC | | | SCAC3 |
| 16 | FCIP | FEDERATED CO-OPS INC | | | SCAC4 |
| 17 | FCIQ | FITZLEY CANADA INC | | | SCAC4 |
| 18 | FCIR | FULL CIRCLE INTERNATIONAL | | | SCAC4 |
| 19 | FCIS | FRANCIS TRUCKING | | | SCAC3 |
| 20 | FCIU | FLORENS ASSET MANAGEMENT COMPANY LIMITED | | HK | BIC |
| 21 | FCIU | FAIRBREEZ SHIPPING CO LTD | | | SCAC4 |
