| 6301 | RMX | Rowena Mathis | Apr-38 | | NRHS |
| 6302 | RMX | *ROWENA MATHIS TANK LINE [WARREN TANK CAR CO.] | | | PWRC |
| 6303 | RMX | *READY MIXED CONCRETE CO | | | PWRC |
| 6304 | RMXB | RAMIREZ EXPRESS | | | SCAC4 |
| 6305 | RMXC | ROYAL MOTOR EXPRESS INC | | | SCAC3 |
| 6306 | RMXC | R & M TRANSPORTATION INC | | | SCAC4 |
| 6307 | RMXE | RMX TRANSPORTATION LLC | | | SCAC4 |
| 6308 | RMXF | RE/MAX ALLEGIANCE RELOCATION SERVIC | | | SCAC4 |
| 6309 | RMXI | RAYMAXX INC | | | SCAC3 |
| 6310 | RMXI | ROM TRANS INC | | | SCAC4 |
| 6311 | RMXM | RANDOM TRANSIT INC | | | SCAC4 |
| 6312 | RMXO | ROMER TRANSPORTATION | | | SCAC4 |
| 6313 | RMXP | ROMEDU EXPRESS LLC | | | SCAC4 |
| 6314 | RMXQ | REMEX | | | SCAC4 |
| 6315 | RMXR | ROCKY MOUNTAIN EXPRESS | | | SCAC3 |
| 6316 | RMXR | ROCKY MOUNTAIN EXPRESS | | | SCAC4 |
| 6317 | RMXS | ROMATIN EXPRESS INC | | | SCAC3 |
| 6318 | RMXS | RM EXPRESS | | | SCAC4 |
| 6319 | RMXT | R MILLENNIUM TRANSPORT | | | SCAC4 |
| 6320 | RMXU | ARAMAX CARGO CONTAINERS RENTAL EST | | UAE | BIC |
| 6321 | RMXW | RUMA TRANSPORT LLC | | | SCAC4 |
| 6322 | RMXY | RAMI MAR TRANSPORT | | | SCAC4 |
| 6323 | RMY | Raya Airways Sdn. Bhd. d/b/a Raya Airways | IATA: TH, Callsign: Raya Express, IATA Prefix: 539, Name changed from Transmile Air Services. | MAL | AVCODES |
| 6324 | RMYI | RAMSEY TRUCKING INC | | | SCAC4 |
| 6325 | RMYT | RAMEY TRUCKING | | | SCAC3 |
| 6326 | RMZ | ROCHELLE MINE | | | PWRC |
| 6327 | RMZB | RAMIREZ, BEATRIZ | | | SCAC3 |
| 6328 | RMZE | RAMIREZ EXPRESS BUS LINE | | | SCAC3 |
| 6329 | RMZH | RAMIREZ HEREDIA, RODOLFO AND RAUL I | | | SCAC4 |
| 6330 | RMZR | RAMIREZ & SONS TRUCKING | | | SCAC3 |
| 6331 | RMZT | RAMIREZ, F | | | SCAC3 |
| 6332 | RMZT | RAM Z LOGISTICS LLC | | | SCAC4 |
| 6333 | RN | Euralair International | ICAO: EUL, Callsign: Euralair, ICAO designator change to ERL. Designator RN reinstated by IATA | F | AVCODES |
| 6334 | RN | Sum Air Services, Inc. | | USA | AVCODES |
| 6335 | RN | Euralair Horizons | ICAO: EUL, Callsign: Euralair, ICAO Designator changed to EUH. Name changed from Euralair International. Designator RN reinstated by IATA | F | AVCODES |
| 6336 | RN | Euralair Horizons | ICAO: EUH, Callsign: Euralair Horizons, Name changed to Air Horizons | F | AVCODES |
| 6337 | RN | Air Horizons | ICAO: EUH, Callsign: Euralair Horizons, Ceased operations during November 2005. Name changed from Euralair Horizons | F | AVCODES |
| 6338 | RN | Aeronexus Corporate Pty Ltd | ICAO: ARN, Callsign: Aeronex, IATA Prefix: 557, | ZA | AVCODES |
| 6339 | RN | Rayani Air Sdn. Bhd. | ICAO: RKT, Callsign: Blue Green, IATA Prefix: 639, Founded on 19 January 2015. Commenced operations on 20 December 2015. Ceased operations on 13 June 2016. | T | AVCODES |
| 6340 | RN | Air Pohang Co., Ltd. | ICAO: KAB, Callsign: Air Pohang, Commenced operations on 07 February 2018. Ceased operations on 29 November 2018. | ROK | AVCODES |
| 6341 | RN | Royal Eswatini National Airways Corporation | ICAO: SZL, Callsign: Eswatini, | SD | AVCODES |
| 6342 | RN | Railion Nederland | | NL | VKM |
| 6343 | RNA | Nepal Airlines Corporation t/a Royal Nepal Airlines | IATA: RA, Callsign: Royal Nepal, IATA Prefix: 285, Name changed to Nepal Airlines Corporation. Founded on 01 July 1958. Designator RA reinstated by IATA | NEP | AVCODES |
| 6344 | RNA | Nepal Airlines Corporation t/a Nepal Airlines | IATA: RA, Callsign: Royal Nepal, IATA Prefix: 285, Name changed from Royal Nepal Airlines Corporation. Founded in 1958. Designator RA reinstated by IATA | NEP | AVCODES |
| 6345 | RNA | Nepal Airlines | IATA: RA | | ICAO1 |
| 6346 | RNA | Royal Nepal Airlines | IATA: RA | | ICAO1 |
| 6347 | RNA | RIPLEY & NEW ALBANY RAILROAD COMPAN | | | SCAC4 |
| 6348 | RNA | Rhein-Meckar Air | Operated by MHS Aciation GmbH | D | TRAFFIC |
| 6349 | RNAC | REINAUER TRANSPORTATION COMPANIES | | | SCAC3 |
| 6350 | RNAC | REINAUER TRANSPORTATION | | | SCAC4 |
| 6351 | RNAE | R & A ENTERPRISES | | | SCAC3 |
| 6352 | RNAF | R & A FREIGHT SERVICES INC | | | SCAC3 |
| 6353 | RNAG | RNA TRANSPORT | | | SCAC4 |
| 6354 | RNAI | R&A TRUCKING COMPANY | | | SCAC3 |
| 6355 | RNAI | R & A TRUCKING CO | | | SCAC4 |
| 6356 | RNAK | R & A TRUCKING CO | | | SCAC3 |
| 6357 | RNAM | R & A LEASING INC | | | SCAC3 |
| 6358 | RNAM | RIDGEWAY NORTH AMERICA LIMITED | | | SCAC4 |
| 6359 | RNAN | RICHNAN CORP | | | SCAC4 |
| 6360 | RNAP | R & A PRODUCE LTD | | | SCAC4 |
| 6361 | RNAQ | RENAUD INC | | | SCAC3 |
| 6362 | RNAQ | RONAN, DOUG AIRCRAFT SALES | | | SCAC4 |
| 6363 | RNAS | RON AND SONS TRUCKING INC | | | SCAC3 |
| 6364 | RNAS | RON & SONS TRUCKING INC | | | SCAC4 |
| 6365 | RNAT | R & A TRUCKING | | | SCAC3 |
| 6366 | RNAT | R & A TRANS CORP | | | SCAC4 |
| 6367 | RNB | Rosneft-Baltika, Joint-Stock Company | Callsign: Rosbalt, | RUS | AVCODES |
| 6368 | RNB | Rosneft-Baltika | | | ICAO1 |
| 6369 | RNB | Ringe - Nyborg Banen | 1897 - 1962 | DK | jernbanen.dk |
| 6370 | RNB | Ringe - Nyborg Banen | 1897 - 1962 | DK | TRAFFIC |
| 6371 | RNBA | R & B TRUCKING | | | SCAC3 |
| 6372 | RNBF | REYNOSO BROS FOODS | | | SCAC3 |
| 6373 | RNBF | R & B FREIGHT LINES | | | SCAC4 |
| 6374 | RNBG | R & B TRANSPORT | | | SCAC3 |
| 6375 | RNBI | R N B INC | | | SCAC3 |
| 6376 | RNBK | R & B TRUCKING | | | SCAC3 |
| 6377 | RNBL | RAINBOW LINES | | | SCAC3 |
| 6378 | RNBM | RAINBOW MOVERS INC | | | SCAC3 |
| 6379 | RNBO | RAINBOW TRANSPORT | | | SCAC3 |
| 6380 | RNBQ | R & B TRUCKING INC | | | SCAC3 |
| 6381 | RNBT | RAINBO OIL COMPANY-TRANSPORT SALES | | | SCAC4 |
| 6382 | RNBV | R & B TRUCK LINE CO | | | SCAC3 |
| 6383 | RNBW | RAINBOW EXPRESS INC | | | SCAC3 |
| 6384 | RNCA | RANCHO NC ALPACAS | | | SCAC4 |
| 6385 | RNCE | R & C EXPRESS INC | | | SCAC3 |
| 6386 | RNCH | RANCH, J B | | | SCAC3 |
| 6387 | RNCH | RANACHO 6 HERMANOS | | | SCAC4 |
| 6388 | RNCH | Railion Schweiz GmbH | | CH | VKM |
| 6389 | RNCI | RAISIN CAIN INC | | | SCAC4 |
| 6390 | RNCK | ROMAN TRUCKING | | | SCAC3 |
| 6391 | RNCK | RONCO EXPRESS INC | | | SCAC4 |
| 6392 | RNCO | RANCHO TRUCKING INC | | | SCAC3 |
| 6393 | RNCP | RENNER, C PETROLEUM | | | SCAC4 |
| 6394 | RNCQ | ROADRUNNER CHARTERS INC | | | SCAC4 |
| 6395 | RNCS | RENEGADE COMPANIES, INC | | | SCAC3 |
| 6396 | RNCT | RANCH TRUCKING | | | SCAC3 |
| 6397 | RNCT | RAINCOAST DOOR & SPECIALTY WOOD PRO | | | SCAC4 |
| 6398 | RNCU | REGENCY NAVIGATION CO LTD | | | SCAC3 |
| 6399 | RNCV | R & C TRANSPORTATION SERVICES INC | | | SCAC4 |
| 6400 | RNCX | North Carolina Dept. of Transportation, Rail Division | 7/2005 (not listed) | | NAKINA |
