| 3401 | RFGT | R F G TRANSPORT INC | | | SCAC4 |
| 3402 | RFH | Yunnan Ruifeng General Aviation Co., Ltd. | Callsign: Nut, | PRC | AVCODES |
| 3403 | RFHS | REINDEER FREIGHT SYSTEM | | | SCAC3 |
| 3404 | RFHS | REFRIGERADOS HERMANOS VELASCO ALCAR | | | SCAC4 |
| 3405 | RFI | National Air Traffic Services Ltd | Callsign: Sherlock, | GB | AVCODES |
| 3406 | RFI | National Air Traffic Services | | | ICAO1 |
| 3407 | RFI | Rete Ferroviaria Italiana | The owner of the FS railway network. | I | TRAFFIC |
| 3408 | RFI | Rete Ferroviaria Italiana | | IT | VKM |
| 3409 | RFII | RAJ FREIGHTLINES INC | | | SCAC4 |
| 3410 | RFIP | RAFFIELD FISHERIES INC | | | SCAC4 |
| 3411 | RFIQ | RITTER FEEDS INC | | | SCAC4 |
| 3412 | RFIS | RELIABLE FREIGHT SYSTEMS, INC | | | SCAC3 |
| 3413 | RFIS | RELIABLE FREIGHT SYSTEMS INC | | | SCAC4 |
| 3414 | RFIU | KUNMING RAILASIA FREIGHT INTERCONTINENTAL CO., LTD. | | PRC | BIC |
| 3415 | RFJ | Royal Falcon of Jordan | IATA: RZ, IATA Prefix: 372, IATA designator changed to RL | JOR | AVCODES |
| 3416 | RFJ | Royal Falcon of Jordan | IATA: RL, IATA Prefix: 372, IATA designator changed from RZ | JOR | AVCODES |
| 3417 | RFJZ | (REAZ) RETIRED 06-17-91 ATP (2465) | | | PWRC |
| 3418 | RFKB | RFK TRANSPORTATION BROKERAGE | | | SCAC4 |
| 3419 | RFKC | RUTHERFORD TRUCKING COMPANY INC | | | SCAC3 |
| 3420 | RFKT | R F K TRANSPORTATION SERVICES INC | | | SCAC3 |
| 3421 | RFL | Interfly | Callsign: Infly, | I | AVCODES |
| 3422 | RFL | Interfly | | | ICAO1 |
| 3423 | RFLB | ROBINSON, C H WORLDWIDE (FLATBED DI | | | SCAC4 |
| 3424 | RFLC | RELIABLE FREIGHT LINES INC | | | SCAC3 |
| 3425 | RFLC | REPUBLIC FREIGHT LLC | | | SCAC4 |
| 3426 | RFLD | ROYAL FOODS LTD | | | SCAC4 |
| 3427 | RFLE | ROBERTO FLORES | | | SCAC4 |
| 3428 | RFLE | Railflex | | D | TRAFFIC |
| 3429 | RFLG | RED FISH LOGISTICS INC | | | SCAC4 |
| 3430 | RFLH | RICHMOND FREIGHT LLC | | | SCAC4 |
| 3431 | RFLI | ROSE FREIGHT LINES INC | | | SCAC3 |
| 3432 | RFLI | RYAN INC | | | SCAC4 |
| 3433 | RFLJ | ROYAL FENCE LIMITED | | | SCAC4 |
| 3434 | RFLL | RED FUNNEL LINE LTD. | | | SCAC3 |
| 3435 | RFLL | RIO FUEL & SUPPLY | | | SCAC4 |
| 3436 | RFLM | RANDALL FARMS LLC | | | SCAC4 |
| 3437 | RFLN | REBEL FREIGHT LINES INC | | | SCAC3 |
| 3438 | RFLN | RIGAL FUELS LLC | | | SCAC4 |
| 3439 | RFLO | RANCHO DE LAS FLORES | | | SCAC4 |
| 3440 | RFLP | ROYAL FREIGHT L P | | | SCAC4 |
| 3441 | RFLQ | R F LOGISTICS LLC | | | SCAC4 |
| 3442 | RFLS | ROBINSON FREIGHT LINES | | | SCAC3 |
| 3443 | RFLS | RAPID FLORAL SYSTEMS (RFS) INC | | | SCAC4 |
| 3444 | RFLU | INTERMODAL TANK TRANSPORT INC. | | USA | BIC |
| 3445 | RFLU | REFRIGERATED FREIGHT LINES LTD | | | SCAC3 |
| 3446 | RFLU | R M I T | | | SCAC4 |
| 3447 | RFLV | ROMEROS FARM LLC | | | SCAC4 |
| 3448 | RFLY | REPUBLIC FREIGHT LLC | | | SCAC4 |
| 3449 | RFMC | R F & MC TRUCK TRANSFER CO INC | | | SCAC4 |
| 3450 | RFMG | ROCKFARM LOGISTICS LLC | | | SCAC4 |
| 3451 | RFMI | RANKIN FARMS INC | | | SCAC4 |
| 3452 | RFMK | RIFICI, MIGUEL TRUCK-N | | | SCAC4 |
| 3453 | RFMM | RYAN FLEET MANAGEMENT | | | SCAC4 |
| 3454 | RFMN | REFACCIONES Y MAQUINARIA DEL NOROES | | | SCAC4 |
| 3455 | RFMO | R & F MOTORS INC | | | SCAC4 |
| 3456 | RFMS | READS MOV | | | SCAC4 |
| 3457 | RFMV | ROCKY FORD MOVING VANS INC | | | SCAC3 |
| 3458 | RFMX | Caldwell-Baker Co. | added 7/1985; eliminated 10/1990; 1/1994-7/2005 (not listed) | | NAKINA |
| 3459 | RFMX | Robert F. Miller | added 1/1974; 1/1975-1/1980; eliminated 7/1985 | | NAKINA |
| 3460 | RFMX | Robert F. Miller | added 1/74; 1/75-1/80 | | NRHS |
| 3461 | RFMX | Caldwell-Baker Co. | eliminated 10/90; 1/94-7/2000 | | NRHS |
| 3462 | RFMX | CALDWELL-BAKER COMPANY {ROBERT F. MILLER] | | | PWRC |
| 3463 | RFMX | Robert F. Miller (Coldwell-Baker) | | | RSRV |
| 3464 | RFMX | CALDWELL-BAKER COMPANY | | | SCAC4 |
| 3465 | RFNI | REACH FOURTY NINE (49) INC | | | SCAC3 |
| 3466 | RFNR | REFINERS TRANSPORT, INC | | | SCAC3 |
| 3467 | RFO | Air Foyal | | F | AVCODES |
| 3468 | RFO | RAIL FORCE | | RO | VKM |
| 3469 | RFOC | RED FLAME OIL CO | | | SCAC4 |
| 3470 | RFOFS | Rail Force One Fleet Services | | NL | TRAFFIC |
| 3471 | RFOH | ROSE FUEL OIL & HEATING COMPANY INC | | | SCAC4 |
| 3472 | RFOJ | REIGEL FUEL OIL LLC | | | SCAC4 |
| 3473 | RFOL | RAUSCH FUEL OIL COMPANY | | | SCAC4 |
| 3474 | RFOM | REIF OIL TRANSPORT | | | SCAC4 |
| 3475 | RFOP | ROBERTSON FUEL OIL INC | | | SCAC4 |
| 3476 | RFOR | RANSFORD, KEN HOLDINGS LTD | | | SCAC4 |
| 3477 | RFOT | RAPID FREIGHT OF TEXAS INC | | | SCAC3 |
| 3478 | RFOW | REMCO FORWARDING LTD | | | SCAC4 |
| 3479 | RFOY | REIT FUEL OIL COMPANY | | | SCAC4 |
| 3480 | RFP | CSX Transportation, Inc. | 1/1994-7/2005 | | NAKINA |
| 3481 | RFP | Richmond, Fredricksburg & Potomac Ry. Co. | added 1/1992; eliminated 7/1992 | | NAKINA |
| 3482 | RFP | Richmond, Fredricksburg & Potomac R.R. Co. | 4/1938-1/1980; eliminated 1/1992 | | NAKINA |
| 3483 | RFP | Richmond, Fredricksburg & Potomac R.R. Co. | 4/38-1/80; eliminated 1/92 | | NRHS |
| 3484 | RFP | Richmond, Fredricksburg & Potomac Ry. Co. | added 1/92; eliminated 7/92 | | NRHS |
| 3485 | RFP | CSX Transportation, Inc. | 1/94-7/2000 | | NRHS |
| 3486 | RFP | CSX TRANSPORTATION, INC. [RICHMOND, FREDERICKSBURG & POTOMAC RR] | | | PWRC |
| 3487 | RFP | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
| 3488 | RFP | Richmond, Fredricksburg & Potomac Railroad | | USA | TRAFFIC |
| 3489 | RFPF | ROCKY FORD PET FOOD INC | | | SCAC3 |
| 3490 | RFPM | REFINED PETROLEUM CO | | | SCAC3 |
| 3491 | RFPO | ROSEBURG FOREST PRODUCTS CO | | | SCAC4 |
| 3492 | RFPU | CSX TRANSPORTATION, INC. | | | PWRC |
| 3493 | RFPU | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
| 3494 | RFPX | Merchants Despatch Transportation Corp. | 7/1937-4/1947 | | NAKINA |
| 3495 | RFPX | Republic Food Products Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 3496 | RFPX | Republic Food Products Co. | 7/1932 | | NAKINA |
| 3497 | RFPX | Republic Food Products Co. (Merchants Despatch Transportation Corp.) | Apr-38 | | NRHS |
| 3498 | RFPX | REPUBLIC FOOD PRODUCTS CO. (MERCHANTS DESPATCH TRANSPORTATION CORP.) | | | PWRC |
| 3499 | RFPZ | CSX TRANSPORTATION, INC. | | | PWRC |
| 3500 | RFPZ | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
