| 6501 | FSMI | FREE STATE MOVING SYSTEMS INC | | | SCAC3 |
| 6502 | FSML | FORMA STEEL LTD | | | SCAC4 |
| 6503 | FSMN | FANEROMENI SPECIAL MARITIME ENTERPR | | | SCAC4 |
| 6504 | FSMO | FOUR STAR MOVERS INC | | | SCAC3 |
| 6505 | FSMO | FLORES MORALES, JULIO EDUARDO | | | SCAC4 |
| 6506 | FSMR | FASSA MARINE LTD | | | SCAC4 |
| 6507 | FSMR | Fort Smith Railroad | Real: FSR | USA | TRAFFIC |
| 6508 | FSMS | F & S MOVING & STORAGE, INC | | | SCAC3 |
| 6509 | FSMS | F & S MOVING & STORAGE, INC | | | SCAC4 |
| 6510 | FSMV | FRANKLIN & SONS MOVING SERVICE | | | SCAC3 |
| 6511 | FSN | Fasons Air Services | Callsign: Fason Air, | WAN | AVCODES |
| 6512 | FSN | Flight Plan Solutions | | USA | AVCODES |
| 6513 | FSNB | FASON BROTHERS TRUCKING | | | SCAC4 |
| 6514 | FSNE | FREESTONE EXPRESS | | | SCAC3 |
| 6515 | FSNG | FR EIGHT (FR8) SINGAPORE PTE LTD | | | SCAC4 |
| 6516 | FSNH | FATHER & SON BROKERAGE LLC | | | SCAC4 |
| 6517 | FSNI | FABER & SON TRUCKING | | | SCAC4 |
| 6518 | FSNK | FRANSEN TRUCKING | | | SCAC4 |
| 6519 | FSNL | FREEZE SAWMILL & LUMBER CO | | | SCAC3 |
| 6520 | FSNR | FIRESTONE NATURAL RUBBER COMPANY LL | | | SCAC4 |
| 6521 | FSNT | FRIERSON TRUCKING | | | SCAC3 |
| 6522 | FSNT | FROST TRANSPORTATION | | | SCAC4 |
| 6523 | FSNU | Firestone Natural Rubber | | | RSRV |
| 6524 | FSNU | FIRESTONE NATURAL RUBBER COMPANY LL | | | SCAC4 |
| 6525 | FSO | Sky One S.r.o. | Callsign: Sky Air, | SK | AVCODES |
| 6526 | FSOB | F & S LOGISTICS LLC | | | SCAC4 |
| 6527 | FSOC | FOURTH STREET ROCK CRUSHER | | | SCAC3 |
| 6528 | FSOD | FRONTIER SOUTH (DIV OF FRONTIER TRA | | | SCAC4 |
| 6529 | FSOF | FIVE SIX ONE THREE FOUR FIVE ONE (5 | | | SCAC4 |
| 6530 | FSOI | FLARE SOLUTIONS INC | | | SCAC4 |
| 6531 | FSOM | FROST OIL CO INC | | | SCAC4 |
| 6532 | FSOS | FOUR SIX ONE SIX ONE SIX THREE (461 | | | SCAC4 |
| 6533 | FSOT | FOUR SEASONS TRAVEL | | | SCAC3 |
| 6534 | FSOT | FULFILLMENT SOLUTIONS OF TEXAS LTD | | | SCAC4 |
| 6535 | FSP | Aperture Aviation, Inc. | Callsign: Snapshot, | USA | AVCODES |
| 6536 | FSP | FERSPED CARGO SA | | RO | VKM |
| 6537 | FSPA | F & S PETROLEUM CORPORATION | | | SCAC4 |
| 6538 | FSPC | FRANOREN SHIPPING CORP | | | SCAC3 |
| 6539 | FSPG | FRITZ, STEPHEN G | | | SCAC3 |
| 6540 | FSPG | FAIRMONT SHIPPING (CANADA) LIMITED | | | SCAC4 |
| 6541 | FSPI | FREIGHT SPECIALIST INC | | | SCAC3 |
| 6542 | FSPL | FS PIPELINE LIMITED, A LIMITED LIAB | | | SCAC3 |
| 6543 | FSPM | FIRST (1ST) PRIORITY TRANSPORTATION | | | SCAC4 |
| 6544 | FSPN | FASSPORT ENTERPRISES INC | | | SCAC4 |
| 6545 | FSPO | F S TRANSPORT | | | SCAC3 |
| 6546 | FSPQ | FREIGHT SPECIALISTS INC | | | SCAC3 |
| 6547 | FSPR | FREIGHT SOLUTION PROVIDERS | | | SCAC4 |
| 6548 | FSPT | FOUR STATES PETROLEUM TRANSPORT INC | | | SCAC4 |
| 6549 | FSPY | FRESHPOINT FRESHCUTS A DIVISION OF | | | SCAC4 |
| 6550 | FSQ | Fly Sky Airlines LLC | Callsign: Kyrgyz Bird, | KS | AVCODES |
| 6551 | FSQL | FOUR SEASONS EQUIPMENT & LEASING IN | | | SCAC4 |
| 6552 | FSQT | FSQ TRUCKING | | | SCAC4 |
| 6553 | FSR | The Flightstar Corporation | Callsign: Flightstar, | USA | AVCODES |
| 6554 | FSR | Air Link Charters | Callsign: Flight Star, | CDN | AVCODES |
| 6555 | FSR | Flightstar Corporation | | | ICAO1 |
| 6556 | FSR | Fort Smith R.R. Co. | added 1/1992; 1/1994-7/2000; eliminated 10/2001; added 4/2002; 7/2005 | | NAKINA |
| 6557 | FSR | Fort Smith R.R. Co. | added 1/92; 1/94-7/2000 | | NRHS |
| 6558 | FSR | FORT SMITH RAILROAD CO. | | | PWRC |
| 6559 | FSR | Fort Smith Railroad | | | RSRV |
| 6560 | FSR | FORT SMITH RAILROAD CO | | | SCAC4 |
| 6561 | FSR | ScotRail Railways Ltd. | Real: SR, 1999: 3016km standard gauge, electrified at 25kV 50Hz First ScotRail is the brand under which First Group PLC runs its railway franchise to operate all domestic passenger services within Scotland, as well as the cross-border Caledonian Sleeper service to London, England. First Group has its headquarters in Aberdeen, Scotland. On 17 October 2004 the franchise was transferred to First Group from National Express resulting in the rebranding from ScotRail to First ScotRail. This was the first time the franchise has been renegotiated since the privatisation of British Rail. | GB | TRAFFIC |
| 6562 | FSRB | FOUR SEASONS RADIATOR | | | SCAC4 |
| 6563 | FSRC | FOUR STAR CONSTRUCTION INC | | | SCAC3 |
| 6564 | FSRC | FSR TRUCKING INC | | | SCAC4 |
| 6565 | FSRF | FOSTER FUELS INC | | | SCAC4 |
| 6566 | FSRH | FULCHER, SCOTT TRUCKING | | | SCAC4 |
| 6567 | FSRM | FIVE STAR TRUCKING INC (5 STAR TRUC | | | SCAC3 |
| 6568 | FSRN | FASTRANS INC | | | SCAC3 |
| 6569 | FSRO | FRASIER TRANSPORT CORP | | | SCAC4 |
| 6570 | FSRP | FIVE STAR RACING PRODUCTS | | | SCAC4 |
| 6571 | FSRQ | FAST TRANSFER INC | | | SCAC4 |
| 6572 | FSRR | Ferrosur S.A. de C.V. | added 10/2003; 7/2005; eliminated 10/2007; added 4/2008 | | NAKINA |
| 6573 | FSRR | Ferrocarril del Sureste, S.A. de C.V. | 7/2000; eliminated 10/2003 | | NAKINA |
| 6574 | FSRR | Ferrocarril del Sureste, S.A. de C.V. | Jul-00 | | NRHS |
| 6575 | FSRR | FERROSUR SA DE CV [FERROCARRIL DEL SURESTE, SA DE CV] | | | PWRC |
| 6576 | FSRR | Ferrocarril del Sureste de CV | | | RSRV |
| 6577 | FSRR | FERROSUR S A DE C V | | | SCAC4 |
| 6578 | FSRR | Ferrocarril del Sureste, S.A. de C.V. | | MEX | TRAFFIC |
| 6579 | FSRS | FSR TRANSPORT LLC | | | SCAC4 |
| 6580 | FSRU | SPANISH MINISTRY OF DEFENCE-SPANISH AIRFORCE | | E | BIC |
| 6581 | FSRW | FREITAS, ROGER WILLIAM | | | SCAC3 |
| 6582 | FSRW | FIRST (1ST) RATE AUTO SHIPPING | | | SCAC4 |
| 6583 | FSRX | F.S. Royster Guano Co. | 7/1935-7/1937 | | NAKINA |
| 6584 | FSRX | Funding Systems Railcars Leasing, Inc. | added 4/1981; eliminated 7/1982 | | NAKINA |
| 6585 | FSRX | Funding Systems Railcars Leasing, Inc. | added 4/81; eliminated 7/82 | | NRHS |
| 6586 | FSRX | *F. S. ROYSTER GUANO CO. | | | PWRC |
| 6587 | FSRX | *FUNDING SYSTEMS RAILCARS LEASING, INC. | | | PWRC |
| 6588 | FSRY | FARRIS, RC & CO | | | SCAC4 |
| 6589 | FSS | Cherokee Air Limited | Callsign: Abaco, | BS | AVCODES |
| 6590 | FSSA | Ferrocarril de Sóller (Mallorca) | Real: FS | E | TRAFFIC |
| 6591 | FSSB | FLAGSHIP SPECIALIZED SHIPPERS | | | SCAC4 |
| 6592 | FSSC | FIRST SCOTT STREET CORPORATION | | | SCAC3 |
| 6593 | FSSC | FLORIDA SILICA SAND COMPANY | | | SCAC4 |
| 6594 | FSSD | FAITH STAR SHIPPING CO., LTD. | | | SCAC3 |
| 6595 | FSSE | FOSS, EDGAR W | | | SCAC3 |
| 6596 | FSSF | FROSSARD FREIGHT WAYS LLC | | | SCAC4 |
| 6597 | FSSG | FREIGHT SAVERS SHIPPING CO LTD | | | SCAC3 |
| 6598 | FSSH | FIVE STAR SHIPPING SERVICES | | | SCAC3 |
| 6599 | FSSH | FIRST (1ST) CLASS HUTCHINSON TRANSP | | | SCAC4 |
| 6600 | FSSJ | FREIGHT SOLUTION SERVICES INC | | | SCAC4 |
