| 6201 | RMRX | ROCKY MOUNTAIN RAILTOURS | | | PWRC |
| 6202 | RMRX | Rocky Mountaineer | | | RSRV |
| 6203 | RMRX | Rocky Mountaineer Railtours | | USA | TRAFFIC |
| 6204 | RMS | TAS Aviation, Inc. | Callsign: Tass Air, | USA | AVCODES |
| 6205 | RMS | Tas Aviation | | | ICAO1 |
| 6206 | RMS | RESERVED JJM | | | PWRC |
| 6207 | RMSB | ROMSBURG, GENE ENTERPRISES | | | SCAC3 |
| 6208 | RMSB | ROAD MASTER TRANSPORT BROKERAGE LP | | | SCAC4 |
| 6209 | RMSD | R & M SERVICE COMPANY/SPECIAL DISTR | | | SCAC3 |
| 6210 | RMSG | RIETH MOVING & STORAGE INC | | | SCAC3 |
| 6211 | RMSG | RENAISSA | | | SCAC4 |
| 6212 | RMSH | RMS | | | SCAC3 |
| 6213 | RMSH | ROOMSTORE, THE | | | SCAC4 |
| 6214 | RMSI | RUSS'S MOTOR SERVICE INC | | | SCAC3 |
| 6215 | RMSI | RUSS'S MOTOR SERVICE INC | | | SCAC4 |
| 6216 | RMSJ | RMS | | | SCAC4 |
| 6217 | RMSK | RIMOUSKI TRANSPORT LIMITEE (DIV OF | | | SCAC3 |
| 6218 | RMSL | RAM SERVICES | | | SCAC3 |
| 6219 | RMSM | R & M STEEL COMPANY | | | SCAC3 |
| 6220 | RMSN | RAMOS TRUCKING | | | SCAC4 |
| 6221 | RMSO | RICHARDS MOVING & STORAGE INC | | | SCAC3 |
| 6222 | RMSO | RIMSCO | | | SCAC4 |
| 6223 | RMSP | RAMSEY TRANSPORT | | | SCAC3 |
| 6224 | RMSP | REYNOLDS, | | | SCAC4 |
| 6225 | RMSQ | ROSKIN, H., MOTOR SERVICE, INC | | | SCAC3 |
| 6226 | RMSR | RABBIT MESSENGER | | | SCAC3 |
| 6227 | RMSR | R & M COURIER SERVICES INC | | | SCAC4 |
| 6228 | RMSS | RMS SERVICE | | | SCAC3 |
| 6229 | RMST | ROADMASTERS TRANSPORT CO LP | | | SCAC4 |
| 6230 | RMSU | TRANSPORTS F.RAMOS,S.L | | E | BIC |
| 6231 | RMSU | R M S EUROPA GMBH | | | SCAC3 |
| 6232 | RMSW | RAMSEY FARM | | | SCAC4 |
| 6233 | RMSX | Harsco Track Technologies | 7/2000-7/2005 (not listed) | | NAKINA |
| 6234 | RMSX | Pandrol Jackson, Inc. | 1/1994 (not listed) | | NAKINA |
| 6235 | RMSX | Pandrol Jackson, Inc. | Jan-94 | | NRHS |
| 6236 | RMSX | Harsco Track Technologies | Jul-00 | | NRHS |
| 6237 | RMSX | *PANDROL JACKSON, INC | | | PWRC |
| 6238 | RMSX | +HARSCO TRACK TECHNOLOGIES | | | PWRC |
| 6239 | RMSX | Harsco Track Technologies | | | RSRV |
| 6240 | RMSX | HARSCO TRACK TECHNOLOGIES | | | SCAC4 |
| 6241 | RMSX | Harsco Track Technologies | | USA | TRAFFIC |
| 6242 | RMSY | RAM SECURITY INC | | | SCAC3 |
| 6243 | RMT | RAM Aircraft Corpration | Callsign: Ram Flight, | USA | AVCODES |
| 6244 | RMT | Ram Aircraft Corporation | | | ICAO1 |
| 6245 | RMT | Reisebüro Mittelthurgau | | CH | TRAFFIC |
| 6246 | RMTC | ROCKY MOUNTAIN TRUCKING II LLC | | | SCAC4 |
| 6247 | RMTD | ROCKY MOUNTAIN SUPPLY INC | | | SCAC3 |
| 6248 | RMTE | ROCKY MOUNTAIN TRUCKING LLC | | | SCAC4 |
| 6249 | RMTF | RINOMATO FINANCIERA S A (PANAMA) | | | SCAC4 |
| 6250 | RMTG | R & M TRUCKING INC | | | SCAC3 |
| 6251 | RMTH | ROCKY MOUNTAIN HOME TRANSPORTATION | | | SCAC3 |
| 6252 | RMTI | RALPHS MOTOR SERVICE INC | | | SCAC3 |
| 6253 | RMTI | R & M TRUCKING | | | SCAC4 |
| 6254 | RMTJ | RM TRANSPORT INC | | | SCAC4 |
| 6255 | RMTK | RAM TRUCKING, INC | | | SCAC3 |
| 6256 | RMTK | RAM TRUCKING INC | | | SCAC4 |
| 6257 | RMTL | RAM TRUCK LINES INC | | | SCAC3 |
| 6258 | RMTL | ROSEMAN TRANSPORT LTD | | | SCAC4 |
| 6259 | RMTM | R&M TRUCKING, Robert J. May, INC | | | SCAC3 |
| 6260 | RMTM | R & M FREIGHT INC (RAIL DIVISION) | | | SCAC4 |
| 6261 | RMTO | R & M TRUCKIN OIL CO | | | SCAC3 |
| 6262 | RMTO | RAM TRANSPORTATION INC | | | SCAC4 |
| 6263 | RMTQ | R M T TRUCKING INC | | | SCAC4 |
| 6264 | RMTS | ROCKY MOUNTAIN TS | | | SCAC3 |
| 6265 | RMTT | ROMAN TRANSPORTATION | | | SCAC3 |
| 6266 | RMTU | R.M.I. CHEMICAL LOGISTICS BV | | NL | BIC |
| 6267 | RMTU | R M I INTERNATIONAL BV | | | SCAC4 |
| 6268 | RMTV | RAMM TRANSPORT INC | | | SCAC3 |
| 6269 | RMTV | RAM TRANSPORTATION SERVICES | | | SCAC4 |
| 6270 | RMTW | R & M TRUCKING CO | | | SCAC3 |
| 6271 | RMTW | R M TRANSPORTS | | | SCAC4 |
| 6272 | RMTY | RASMUSEN, MIKE TRUCKING | | | SCAC4 |
| 6273 | RMU | C.S.P., Societe | Callsign: Air-Maur, | RIM | AVCODES |
| 6274 | RMU | C.S.P., Societe | | | ICAO1 |
| 6275 | RMUD | ROMULUS DEVELOPMENT CORP | | | SCAC3 |
| 6276 | RMUT | ROCKY MOUNTAIN TANK COMPANY | | | SCAC3 |
| 6277 | RMV | Romanian Aviation Company ROMAVIA R.A. | IATA: WQ, Callsign: Aeromavia, IATA Prefix: 534, Designator WQ reinstated by IATA. Declared bankrupt and ceased operations in August 2014. | RO | AVCODES |
| 6278 | RMV | Romavia | | | ICAO1 |
| 6279 | RMV | Rhein-Main-Verkehrsverbund | | D | TRAFFIC |
| 6280 | RMVA | REFRIGERADOS MONTERREY VALLE SA DE | | | SCAC4 |
| 6281 | RMVE | RICKS MOVING & EXPRESS | | | SCAC3 |
| 6282 | RMVG | RAMAR MOVING SYSTEMS INC | | | SCAC3 |
| 6283 | RMVG | RAMAR MOVING SYSTEMS INC | | | SCAC4 |
| 6284 | RMVI | RICHS MOVING SERVICES | | | SCAC3 |
| 6285 | RMVL | RAPID MOVEMENT LTD | | | SCAC3 |
| 6286 | RMVN | RICHARDS MOVING & STORAGE INC | | | SCAC4 |
| 6287 | RMVQ | RMV TRUCKING COMPANY | | | SCAC3 |
| 6288 | RMVR | ROE MOVERS | | | SCAC3 |
| 6289 | RMVS | RANDOLPH TRANSPORTATION INC | | | SCAC3 |
| 6290 | RMVS | RANDOLPH TRANSPORTATION INC | | | SCAC4 |
| 6291 | RMWC | RANGE, MELVIN W INC | | | SCAC4 |
| 6292 | RMWI | R M W INC | | | SCAC3 |
| 6293 | RMWN | RELOCATION MANAGEMENT WORLDWIDE INC | | | SCAC4 |
| 6294 | RMWQ | RM WAREHOUSE | | | SCAC3 |
| 6295 | RMWS | ROOSEVELT, M W & SON INC | | | SCAC3 |
| 6296 | RMWT | ROGERS, M & W TRUCKING | | | SCAC3 |
| 6297 | RMX | Air Max Ltd. | Callsign: Aeromax, Ceased Operations. | BG | AVCODES |
| 6298 | RMX | Air Max | | | ICAO1 |
| 6299 | RMX | Rowena Mathis Tank Line | 1/1941-4/1947 | | NAKINA |
| 6300 | RMX | Rowena Mathis, care of Warren Tank Car Co. | 7/1937-4/1938 | | NAKINA |
