| 401 | RRU | Cirrus | | | ICAO1 |
| 402 | RRUC | R & R TRUCKING INC (LOGISTICS DIVIS | | | SCAC4 |
| 403 | RRUK | R AND R TRUCKING INC. | | | SCAC3 |
| 404 | RRUK | R & R TRUCKING INC | | | SCAC4 |
| 405 | RRUN | ROAD RUNNER TRAVEL & TOURS | | | SCAC3 |
| 406 | RRV | Mombasa Air Safari Ltd. | Callsign: Skyrover, | EAK | AVCODES |
| 407 | RRV | Mombasa Air Safari | | | ICAO1 |
| 408 | RRVD | RIVER RIDGE LOGISTICS LLC | | | SCAC4 |
| 409 | RRVI | RED RIVER INTERNATIONAL LLC | | | SCAC4 |
| 410 | RRVL | REYNALDO RIVERA-SCULPTOR INC | | | SCAC4 |
| 411 | RRVM | RAMOS RIVERA, MAURICIO | | | SCAC4 |
| 412 | RRVN | ROAD RUNNER VAN LINES INC | | | SCAC4 |
| 413 | RRVR | ROBERTS RIVER RIDES INC | | | SCAC3 |
| 414 | RRVR | RED RIVER HOLDINGS LLC | | | SCAC4 |
| 415 | RRVT | ROOT RIVER VALLEY TRANSFER, INC | | | SCAC3 |
| 416 | RRVT | ROOT RIVER VALLEY TRANSFER INC | | | SCAC4 |
| 417 | RRVW | Red River Valley and Western R.R. | added 1/1988; 1/1994-7/2005 | | NAKINA |
| 418 | RRVW | Red River Valley and Western R.R. | added 1/88; 1/94-7/2000 | | NRHS |
| 419 | RRVW | RED RIVER VALLEY & WESTERN RAILROAD CO. | | | PWRC |
| 420 | RRVW | Red River Valley and Western Railroad | | | RSRV |
| 421 | RRVW | RED RIVER VALLEY & WESTERN RAILROAD | | | SCAC3 |
| 422 | RRVW | RED RIVER VALLEY & WESTERN RAILROAD | | | SCAC4 |
| 423 | RRWA | RUN-R-WAY EXPRESS CO INC | | | SCAC3 |
| 424 | RRWA | RUN-R-WAY EXPRESS CO INC | | | SCAC4 |
| 425 | RRWL | REEVAS RITINGS WITH RUACH LLC | | | SCAC4 |
| 426 | RRWO | RENFROWS TRUCKING INC | | | SCAC4 |
| 427 | RRWR | RADOVICH, R W TRANSPORT INC | | | SCAC4 |
| 428 | RRWT | RED ARROW TRUCKING | | | SCAC3 |
| 429 | RRWX | THE SOUTH CAROLINA RAILROAD MUSEUM | | | SCAC4 |
| 430 | RRXB | R & R TRANSPORT LLC | | | SCAC4 |
| 431 | RRXC | RED ROSE TRANSPORTATION INC | | | SCAC4 |
| 432 | RRXE | R&R EXPRESS | | | SCAC3 |
| 433 | RRXE | R & R EXPRESS | | | SCAC4 |
| 434 | RRXI | RAMAR TRANSPORTATION INC | | | SCAC4 |
| 435 | RRXM | R & R TRANSPORTATION | | | SCAC4 |
| 436 | RRXN | R & R EXPRESS INC | | | SCAC4 |
| 437 | RRXP | ROAD RUNNER PACKAGE EXPRESS | | | SCAC3 |
| 438 | RRXP | RIVERRUN EXPRESS INC | | | SCAC4 |
| 439 | RRXQ | ROMIR EXPRESS INC | | | SCAC4 |
| 440 | RRXS | R & R EXPRESS | | | SCAC4 |
| 441 | RRXT | RREX TRUCKING INC | | | SCAC4 |
| 442 | RRXU | PETIT FORESTIER CONTAINER NEDERLAND BV | | NL | BIC |
| 443 | RRXU | REFTRADE RENTAL B V | | | SCAC4 |
| 444 | RRY | R B Airline UK Ltd/Aviana Airways Ltd operating as Royal Bengal Airlines | IATA: 4A, Callsign: Royal Bengal, Founded in 2006. Commenced commercial operations on 31 January 2008. | BD | AVCODES |
| 445 | RRY | Tbilisi Aviation University | | | ICAO1 |
| 446 | RRYP | REY REY PRODUCE INC | | | SCAC4 |
| 447 | RRYS | RIGEL REEDEREI GMBH & CO KG MT | | | SCAC4 |
| 448 | RRYT | ROAD READY TRUCKING CO | | | SCAC3 |
| 449 | RRZ | Rollright Aviation Ltd. | Callsign: Rollright, | GB | AVCODES |
| 450 | RRZ | Rollright Aviation | | | ICAO1 |
| 451 | RRZR | RAMOS RODRIGUEZ, RICARDO GUADALUPE | | | SCAC4 |
