| 5901 | RMCZ | *(REAZ) RETIRED 04-06-93 ATP (ACI 2356) | | | PWRC |
| 5902 | RMCZ | *RINKER MATERIALS CORP. | | | PWRC |
| 5903 | RMD | Air Amder S.A. | Callsign: Air Amder, | RIM | AVCODES |
| 5904 | RMD | Air Amder | | | ICAO1 |
| 5905 | RMDC | RMDC TRUCKING LLC | | | SCAC4 |
| 5906 | RMDF | RM LOGISTIC | | | SCAC4 |
| 5907 | RMDL | RAMSDELL TRUCKING COMPANY | | | SCAC3 |
| 5908 | RMDQ | RETAIL MERCHANTS DELIVERY | | | SCAC3 |
| 5909 | RMDQ | R AND M FREIGHT INC | | | SCAC4 |
| 5910 | RMDS | REFRIGERADOS MARIA DEL CARMEN MORAL | | | SCAC4 |
| 5911 | RMDW | REIMUND, WERNER | | | SCAC4 |
| 5912 | RMDX | American Refrigerator Transit Co. | added 7/1962; 7/1965-4/1970; eliminated 4/1974; 1/1975-1/1980; added 7/1982; 1/1994-7/2005; eliminated 1/2010 | | NAKINA |
| 5913 | RMDX | American Refrigerator Transit Co. | 7/65-4/70; eliminated 4/74; 1/75-1/80; added 7/82; 1/94-7/2000 | | NRHS |
| 5914 | RMDX | (MLCX) AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 5915 | RMDX | American Refrigerator Transit | | | RSRV |
| 5916 | RMDX | AMERICAN REFRIGERATOR TRANSIT CO. | | | SCAC4 |
| 5917 | RMDY | REMEDY EXPRESS INC | | | SCAC4 |
| 5918 | RME | Armenian Airlines | IATA: R3, Callsign: Armenian, IATA Prefix: 956, Suspended operations on 15 April 2003. | AM | AVCODES |
| 5919 | RME | Armenian Airlines | IATA: R3 | | ICAO1 |
| 5920 | RME | Röbel/Müritz Eisenbahn GmbH | Röbel | D | privat-bahn.de |
| 5921 | RME | Röbel/Müritz Eisenbahn GmbH | | DE | VKM |
| 5922 | RMEA | RAME AUTOTRANSPORTES SA DE CV | | | SCAC4 |
| 5923 | RMEC | RME TRANSPORTATION CO INC | | | SCAC3 |
| 5924 | RMEE | ROME EXPRESS INC | | | SCAC3 |
| 5925 | RMEF | ROMEO FORWARDERS INC | | | SCAC3 |
| 5926 | RMEH | ROMANS ELECTRIC INC | | | SCAC4 |
| 5927 | RMEI | R M E INC | | | SCAC3 |
| 5928 | RMEN | RED MAPLE ENTERPRISES INC | | | SCAC4 |
| 5929 | RMEO | ROMEO EXPEDITORS INC | | | SCAC3 |
| 5930 | RMEO | ROMEO EXPEDITORS INC | | | SCAC4 |
| 5931 | RMEP | REYMAR ENTERPRISE LLC | | | SCAC4 |
| 5932 | RMEQ | READY MACHINERY & EQUIPMENT (CANADA | | | SCAC4 |
| 5933 | RMER | RISELING MOTOR EXPRESS INC | | | SCAC4 |
| 5934 | RMES | REMINES, WM JR | | | SCAC3 |
| 5935 | RMES | R & M | | | SCAC4 |
| 5936 | RMET | R M E TRANSPORT, INC | | | SCAC3 |
| 5937 | RMEV | ROMANS, STEVE | | | SCAC3 |
| 5938 | RMEV | ROAD MAINTENANCE EQUIPMENT AND SERV | | | SCAC4 |
| 5939 | RMEW | ROYAL MOTOR EXPRESSWAYS INC | | | SCAC3 |
| 5940 | RMEY | RAMEY WAREHOUSE COMPANY | | | SCAC3 |
| 5941 | RMF | Royal Malaysian Air Force | Callsign: Angkasa, | MAL | AVCODES |
| 5942 | RMF | Royal Malaysian Air Force | | | ICAO1 |
| 5943 | RMFB | RPM MOTOR FREIGHT LTD | | | SCAC4 |
| 5944 | RMFC | R M F TRUCKING CO INC | | | SCAC3 |
| 5945 | RMFC | RUMFORDS CANARY LINES | | | SCAC4 |
| 5946 | RMFD | ROBERTSON MOHAWK FUEL DISTRIBUTORS | | | SCAC3 |
| 5947 | RMFE | ROSSI MOTOR FREIGHT | | | SCAC4 |
| 5948 | RMFG | RAM MOTOR FREIGHT | | | SCAC3 |
| 5949 | RMFG | RAM MOTOR FREIGHT | | | SCAC4 |
| 5950 | RMFH | ROBERTS MOTOR FREIGHT INC | | | SCAC3 |
| 5951 | RMFI | R & M FREIGHT INC | | | SCAC4 |
| 5952 | RMFK | R M F TRUCKING CO INC | | | SCAC3 |
| 5953 | RMFM | RAKHRA MUSHROOM FARM | | | SCAC4 |
| 5954 | RMFN | REYNALDOS MEXICAN FOOD COMPANY | | | SCAC4 |
| 5955 | RMFO | ROCKY & MARCIANO FUEL OIL INC | | | SCAC4 |
| 5956 | RMFQ | ROCKET MOTOR FREIGHT LINES, INC. | | | SCAC3 |
| 5957 | RMFQ | R & M TRANSFER LLC | | | SCAC4 |
| 5958 | RMFR | ROGUE MOTOR FREIGHT INC | | | SCAC4 |
| 5959 | RMFS | REIMER FARM SUPPLIES LTD | | | SCAC4 |
| 5960 | RMFT | RMF TRUCKING INC | | | SCAC3 |
| 5961 | RMFT | R & M FREIGHT INC | | | SCAC4 |
| 5962 | RMFV | ROCKY MOUNTAIN FREIGHT SRVICE INC | | | SCAC3 |
| 5963 | RMFY | RAYMAN MOTOR FREIGHT SYSTEMS | | | SCAC4 |
| 5964 | RMG | Rumugu Air & space Nigeria Limited | Callsign: Rumugu Air, | WAN | AVCODES |
| 5965 | RMG | Rumugu Air & Space Nigeria | | | ICAO1 |
| 5966 | RMGB | RMGC ASSOCIATES LLC | | | SCAC4 |
| 5967 | RMGE | RED MAPLE GIANT INDUSTRIAL | | | SCAC4 |
| 5968 | RMGF | REMINGTON FREIGHT SERVICES | | | SCAC3 |
| 5969 | RMGH | RAMADA LOGISTICS LTD | | | SCAC4 |
| 5970 | RMGM | RODRIGUEZ MONSALVE, GUILLERMO ISAIA | | | SCAC4 |
| 5971 | RMGQ | REDSTONE MEDIA GROUP INC | | | SCAC4 |
| 5972 | RMGS | ROLLINS MOVING SYSTEMS | | | SCAC3 |
| 5973 | RMGU | RESOLVE MARINE GROUP, INC. | | USA | BIC |
| 5974 | RMGW | ROULETTE MANAGEMENT SERVICES LLC | | | SCAC4 |
| 5975 | RMGX | The Andersons-Rail Group | added 10/2004; 7/2005 | | NAKINA |
| 5976 | RMGX | Railcar, Ltd. | added 10/1989; 1/1994-7/2000; eliminated 10/2004 | | NAKINA |
| 5977 | RMGX | Railcar, Ltd. | added 10/89; 1/94-7/2000 | | NRHS |
| 5978 | RMGX | THE ANDERSONS-RAIL GROUP [RAILCAR LIMITED] | | | PWRC |
| 5979 | RMGX | Railcar Limited | | | RSRV |
| 5980 | RMGX | ANDERSONS INC, THE | | | SCAC4 |
| 5981 | RMGY | RMG FAMILY SUGAR BUSH | | | SCAC4 |
| 5982 | RMHA | RMH TRANSFER | | | SCAC4 |
| 5983 | RMHB | RMH LOGISTICS LLC | | | SCAC4 |
| 5984 | RMHC | RMH MOTOR COACH | | | SCAC3 |
| 5985 | RMHD | ROCKY MOUNTAIN HOLSTEINS LTD | | | SCAC4 |
| 5986 | RMHI | ROYAL MOTOR HAULAGE | | | SCAC3 |
| 5987 | RMHI | RMH TRANSPORT INC | | | SCAC4 |
| 5988 | RMHL | RICHMAN-HELSTROM TRUCKING INC | | | SCAC3 |
| 5989 | RMHL | RICHMAN-HELSTROM TRUCKING INC | | | SCAC4 |
| 5990 | RMHM | RIVERSIDE MOBILE HOME MOVERS INC | | | SCAC3 |
| 5991 | RMHO | RILEYS MOBILE HOME MOVERS | | | SCAC3 |
| 5992 | RMHQ | RACINE MACHINERY MOVERS | | | SCAC3 |
| 5993 | RMHT | R.E.D. MOBILE HOME TRANSPORTATION | | | SCAC3 |
| 5994 | RMHU | RESPIRATION ZRT | | | SCAC4 |
| 5995 | RMHV | ROBERTS MOBILE HOME TRANSPORT | | | SCAC3 |
| 5996 | RMHW | ROCKY MOUNTAIN HOTSHOT INC | | | SCAC4 |
| 5997 | RMHX | REDONDO MARINE HARDWARE | | | PWRC |
| 5998 | RMHX | REDONDO MARINE HARDWARE | | | SCAC4 |
| 5999 | RMI | Point Airlines Limited | Callsign: Point Airline, | WAN | AVCODES |
| 6000 | RMI | Point Airlines | | | ICAO1 |
