| 6001 | RMIA | RELIABLE EXPRESS | | | SCAC4 |
| 6002 | RMIB | ROBBINS MARITIME INC | | | SCAC4 |
| 6003 | RMIC | ROBINSON & MASTRANGELO INC | | | SCAC3 |
| 6004 | RMID | REMOTE MEDICAL INTERNATIONAL | | | SCAC4 |
| 6005 | RMIE | ROADTREK MOTORHOMES INC | | | SCAC4 |
| 6006 | RMIH | R M T INC | | | SCAC3 |
| 6007 | RMIH | R M T INC | | | SCAC4 |
| 6008 | RMII | RAM INTERNATIONAL INC | | | SCAC4 |
| 6009 | RMIK | ROCHE, MIKE INC | | | SCAC4 |
| 6010 | RMIO | RMI | | | SCAC4 |
| 6011 | RMIP | RAY & MASCARI INC | | | SCAC4 |
| 6012 | RMIQ | ROBERTSONS MARINE INC | | | SCAC4 |
| 6013 | RMIR | READING MATERIALS INC | | | SCAC4 |
| 6014 | RMIS | RIMINI SHIPPING CORPORATION | | | SCAC3 |
| 6015 | RMIT | RED MOUNTAIN TRUCK LINES INC | | | SCAC4 |
| 6016 | RMIU | MI ENVIRONMENTAL SERVICES | | | PWRC |
| 6017 | RMIU | Mi Environmental Services | | | RSRV |
| 6018 | RMIX | Ready Mixed Concrete Co. | added 7/1984; 1/1994-7/2005 | | NAKINA |
| 6019 | RMIX | Ready Mixed Concrete Co. | added 7/84; 1/94-7/2000 | | NRHS |
| 6020 | RMIX | READY MIXED CONCRETE CO. | | | PWRC |
| 6021 | RMIX | Ready Mix Concrete | | | RSRV |
| 6022 | RMIX | READY MIX CONCRETE COMPANY | | | SCAC4 |
| 6023 | RMIZ | R M I GLOBAL LOGISTICS INC | | | SCAC4 |
| 6024 | RMJC | RUDOLPH, M J CORPORATION | | | SCAC3 |
| 6025 | RMJE | RAMIREZ JIMENEZ, IGNACIO | | | SCAC4 |
| 6026 | RMJG | R M J TRUCKING | | | SCAC3 |
| 6027 | RMJK | R M J TRUCKING | | | SCAC3 |
| 6028 | RMJP | ROMERO, JOHN P | | | SCAC3 |
| 6029 | RMJR | ROBINSON, M J TRUCKING LTD | | | SCAC3 |
| 6030 | RMJT | RMJ TRANS INC | | | SCAC3 |
| 6031 | RMJT | ROCHER TREJO, MANUEL JESUS | | | SCAC4 |
| 6032 | RMJX | Rieck-McJunkin Dairy Co. | 7/1935-4/1938 | | NAKINA |
| 6033 | RMJX | Rieck-McJunkin Dairy Co. | Apr-38 | | NRHS |
| 6034 | RMJX | RIECK-MCJUNKIN DAIRY CO. | | | PWRC |
| 6035 | RMK | Rusavia, International Aviatransport Corporation, Joint-Stock Company | Callsign: Rusavia, | RUS | AVCODES |
| 6036 | RMK | Simrik Airlines Pvt. Ltd. | Callsign: Simrik Air, | NEP | AVCODES |
| 6037 | RMKA | R M T TRUCKING INC | | | SCAC4 |
| 6038 | RMKB | REMARKABLE TOURS INC | | | SCAC3 |
| 6039 | RMKC | RM TRUCKING CO | | | SCAC3 |
| 6040 | RMKC | ROEMER TRUCKING LLC | | | SCAC4 |
| 6041 | RMKE | RMK INC | | | SCAC3 |
| 6042 | RMKF | REDEEMED TRUCKING INC | | | SCAC4 |
| 6043 | RMKH | RICK & MARK TRUCKING | | | SCAC4 |
| 6044 | RMKI | R & M TRUCKING | | | SCAC4 |
| 6045 | RMKK | RAMSA TRUCKING INC | | | SCAC4 |
| 6046 | RMKL | ROOD, MIKE TRANSPORT LLC | | | SCAC4 |
| 6047 | RMKN | RAMOS TRUCKING | | | SCAC4 |
| 6048 | RMKP | R & M TRUCKING OF | | | SCAC4 |
| 6049 | RMKQ | RICKMAN TRUCKING | | | SCAC4 |
| 6050 | RMKT | R M K TRUCKING INC | | | SCAC3 |
| 6051 | RMKT | ROMARK TRANSPORTATION INC | | | SCAC4 |
| 6052 | RMKV | R & M TRUCKING CO | | | SCAC4 |
| 6053 | RMKW | RAAMSDONK TRUCKING LTD | | | SCAC4 |
| 6054 | RMKY | ROCKY MOUNTAIN TRANSPORTATION INC | | | SCAC4 |
| 6055 | RML | Armenian International Airways | IATA: MV, Founded in 2002. Merged with Armavia during 2005. | AM | AVCODES |
| 6056 | RML | Armenian International Airways | IATA: MV | | ICAO1 |
| 6057 | RML | Roma Marche Linee Spa. | | I | TRAFFIC |
| 6058 | RML | RM LINES, a.s. | | CZ | VKM |
| 6059 | RMLA | ROMLA COMPANY | | | SCAC4 |
| 6060 | RMLB | RM LOGISTICS INC | | | SCAC4 |
| 6061 | RMLC | R & M LEASING CORP | | | SCAC3 |
| 6062 | RMLC | R & M LEASING CORP | | | SCAC4 |
| 6063 | RMLD | RIVERA MEDINA, LUIS | | | SCAC4 |
| 6064 | RMLE | RAMSEY OIL CO INC | | | SCAC4 |
| 6065 | RMLF | R & M LUMBER SALES INC | | | SCAC4 |
| 6066 | RMLG | ROAD MARK LOGISTICS INC | | | SCAC4 |
| 6067 | RMLH | REIMER MANAGEMENT LTD | | | SCAC4 |
| 6068 | RMLI | R & M LUMBER SALES INC | | | SCAC3 |
| 6069 | RMLI | RML TRANSPORT INC | | | SCAC4 |
| 6070 | RMLJ | ROCKY MOUNTAIN LOGISTICS INC | | | SCAC4 |
| 6071 | RMLK | RICHGELS MILK SERVICE INC | | | SCAC3 |
| 6072 | RMLL | R M LOGISTICS INC | | | SCAC4 |
| 6073 | RMLN | R & M LOGISTICS INC | | | SCAC4 |
| 6074 | RMLO | REMLO LOGISTICS, INC | | | SCAC3 |
| 6075 | RMLO | ROSENBAUER MINNESOTA LLC | | | SCAC4 |
| 6076 | RMLP | RAMOS, LAZARO | | | SCAC4 |
| 6077 | RMLR | RAM LOGISTICS LLC | | | SCAC4 |
| 6078 | RMLS | R & M LIVESTOCK & TRUCKING | | | SCAC3 |
| 6079 | RMLS | RAM LOGISTICS LLC | | | SCAC4 |
| 6080 | RMLT | RAMLER TRUCKING | | | SCAC3 |
| 6081 | RMLT | RAMLER TRUCKING INC | | | SCAC4 |
| 6082 | RMLU | ROYAL MAIL LINES LIMITED | | | PWRC |
| 6083 | RMLU | Royal Mail Lines Limited | | | RSRV |
| 6084 | RMLU | HAMBURG SUED | | | SCAC4 |
| 6085 | RMLV | ROYAL MK LOGISTICS INC | | | SCAC4 |
| 6086 | RMLX | PMG LEASING, LLC | | | PWRC |
| 6087 | RMLX | RMG LEASING LLC | | | SCAC4 |
| 6088 | RMLY | RAY-MONT LOGISTICS INC | | | SCAC4 |
| 6089 | RMM | AiRom 2000 S.R.L. | Callsign: Airom Flyer, Ceased operations. | RO | AVCODES |
| 6090 | RMMB | R & M MOBILE HOME MOVERS | | | SCAC3 |
| 6091 | RMMC | RADIGAN & MCGILLY MOVING & STORAGE | | | SCAC3 |
| 6092 | RMMC | ROMERO, M & M TRANSPORT LLC | | | SCAC4 |
| 6093 | RMMD | R & M MEYER | | | SCAC4 |
| 6094 | RMME | ROCKY MOUNTAIN MILLWRIGHTS & MACHIN | | | SCAC3 |
| 6095 | RMME | RAMIREZ MARTINEZ, ENRIQUE | | | SCAC4 |
| 6096 | RMMI | Reggia Marina Militare Italiana | | I | TRAFFIC |
| 6097 | RMMO | RADIGAN & MCGILLY MOVING SERVICE IN | | | SCAC3 |
| 6098 | RMMO | RAMIREZ, MARIO | | | SCAC4 |
| 6099 | RMMS | RAM MESSENGER SERVICE LTD | | | SCAC3 |
| 6100 | RMMT | R A M TRANSPORTATION INC | | | SCAC3 |
