| 1 | FSC | Four Star Aviation | IATA: HK, Callsign: Four Star, IATA Prefix: 861, Designator HK reinstated by IATA | VI | AVCODES |
| 2 | FSC | Four Star Aviation | Callsign: Four Star, Designator HK recalled by IATA | VI | AVCODES |
| 3 | FSC | Four Star Cargo | IATA: HK | | ICAO1 |
| 4 | FSCA | FEDERAL SERVICES COMPANY | | | SCAC3 |
| 5 | FSCB | FARM SERVICE COMPANY | | | SCAC4 |
| 6 | FSCC | F S C CORP | | | SCAC3 |
| 7 | FSCD | FIVE STAR CONSOLIDATION SERVICE | | | SCAC3 |
| 8 | FSCD | FEEDING SYSTEMS CANADA | | | SCAC4 |
| 9 | FSCE | FARMERS SEAFOOD COMPANY INC | | | SCAC4 |
| 10 | FSCH | FOESCH TRANSFER LINE | | | SCAC3 |
| 11 | FSCH | FRISCHKORN ASSOCIATES INC | | | SCAC4 |
| 12 | FSCI | FLOYDS OF SOUTH CAROLINA INC | | | SCAC3 |
| 13 | FSCJ | FIVE STAR COACH INC | | | SCAC3 |
| 14 | FSCJ | FISCHER TRUCKING | | | SCAC4 |
| 15 | FSCK | FISCHER TRUCKING INC | | | SCAC4 |
| 16 | FSCL | FIRST CLASS LIMOUSINE SERVICE INC | | | SCAC3 |
| 17 | FSCL | FLORENCIA SHIPPING COMPANY LIMITED | | | SCAC4 |
| 18 | FSCN | FAMILY SWEETS CANDY COMPANY INC | | | SCAC3 |
| 19 | FSCO | FARM SUPPLY CO | | | SCAC3 |
| 20 | FSCO | FARM SUPPLY CO | | | SCAC4 |
| 21 | FSCP | FOUR STATES TRANSPORTATION COMPANY | | | SCAC3 |
| 22 | FSCQ | FIRST STEAMSHIP CORP LTD TAIWAN | | | SCAC3 |
| 23 | FSCR | FIRST COURIER | | | SCAC3 |
| 24 | FSCS | FASCO CONTROLS CORP | | | SCAC3 |
| 25 | FSCT | FIRST CLASS TRANSPORT (1ST CLASS TR | | | SCAC3 |
| 26 | FSCU | FLORENS ASSET MANAGEMENT COMPANY LIMITED | | HK | BIC |
| 27 | FSCV | FIRST SCOTTS VALLEY INC | | | SCAC3 |
| 28 | FSCV | FARM SUPPLY DISTRIBUTORS INC | | | SCAC4 |
| 29 | FSCW | FIRST SHIPCO INC. | | | SCAC3 |
| 30 | FSCW | FLETES SANTA LUCIA SA DE CV | | | SCAC4 |
| 31 | FSCX | Frank Mitacek Railway Service | added 1/1983; eliminated 1/1989 | | NAKINA |
| 32 | FSCX | Ferro Standard Corp. | added 10/1966; 10/1966; eliminated 10/1968 | | NAKINA |
| 33 | FSCX | Freeport Sulphur Co. | 7/1930-4/1947; added 7/1958; eliminated 10/1958 | | NAKINA |
| 34 | FSCX | Freeport Sulphur Co. | 4/38; added 7/58; eliminated 10/58 | | NRHS |
| 35 | FSCX | Ferro Standard Corp. | added 10/66; 10/66; eliminated 10/68 | | NRHS |
| 36 | FSCX | Frank Mitacek Railway Service | added 1/83; eliminated 1/89 | | NRHS |
| 37 | FSCX | *FREEPORT SULPHUR CO. | | | PWRC |
| 38 | FSCX | *FERRO STANDARD CORP. | | | PWRC |
| 39 | FSCX | *FRANK MITACEK RAILWAY SERVICE | | | PWRC |
| 40 | FSCX | Frank Mitacek Railway Service | | | RSRV |
| 41 | FSCY | FORESHEW, CAREY TRUCKING | | | SCAC3 |
