| 7001 | ROJT | ROJO TRUCKING INC | | | SCAC4 |
| 7002 | ROJW | ROGERS, J W, INC | | | SCAC3 |
| 7003 | ROK | National Airlines | Callsign: Red Rock, Founded in 1998. Commenced operations on 27 May 1999. Ceased opertions on 06 November 2002. | USA | AVCODES |
| 7004 | ROK | Red Rock Flight School | Callsign: Red Rock, | USA | AVCODES |
| 7005 | ROK | National Airlines | IATA: N7 | | ICAO1 |
| 7006 | ROKA | ROKA | | | SCAC3 |
| 7007 | ROKB | ROYAL TRUCKING | | | SCAC4 |
| 7008 | ROKC | ROCKY MOUNTAIN TRUCKING | | | SCAC3 |
| 7009 | ROKC | R O C TRUCKING INC | | | SCAC4 |
| 7010 | ROKE | ROANOKE OIL DISTRIBUTORS INC | | | SCAC4 |
| 7011 | ROKEM | KEMWATER CRISTAL SRL | | RO | VKM |
| 7012 | ROKG | ROYAL CITY TRUCKING | | | SCAC4 |
| 7013 | ROKL | ROK TRUCK LINES INC | | | SCAC3 |
| 7014 | ROKL | ROK LOGISTICS | | | SCAC4 |
| 7015 | ROKN | RAST, OSCAR TRUCKING CO | | | SCAC3 |
| 7016 | ROKQ | ROARK TRUCKING CO | | | SCAC3 |
| 7017 | ROKS | ROBINSON, KARL S TRUCKING COMPANY I | | | SCAC3 |
| 7018 | ROKS | ROBINSON, KARL S TRUCKING COMPANY I | | | SCAC4 |
| 7019 | ROKT | ROMEOS TRUCKING LTD | | | SCAC4 |
| 7020 | ROKX | Alpha Crushed Stone, Inc. | added 7/1972; eliminated 10/1974 | | NAKINA |
| 7021 | ROKX | Alpha Crushed Stone, Inc. | eliminated 10/74 | | NRHS |
| 7022 | ROKX | *ALPHA CRUSHED STONE, INC. | | | PWRC |
| 7023 | ROKX | +CAROLINA POWER & LIGHT CO. d/b/a PROGRESS ENERGY, INC. | | | PWRC |
| 7024 | ROKX | CAROLINS POWER & LIGHT D/B/A PROGRE | | | SCAC4 |
| 7025 | ROKY | ROCKY MOUNTAIN SUPPLY INC | | | SCAC4 |
| 7026 | ROL | Aeroel Airways Ltd. | Callsign: Aeroel, | IL | AVCODES |
| 7027 | ROL | Aeroel Airways | | | ICAO1 |
| 7028 | ROLA | ROWLAND DRAYAGE CORPORATION | | | SCAC3 |
| 7029 | ROLB | ROLLET BROS LOGISTICS | | | SCAC4 |
| 7030 | ROLD | ROULAND TRUCKING SERVICE | | | SCAC3 |
| 7031 | ROLD | ROLLET BROS TRUCKING CO INC | | | SCAC4 |
| 7032 | ROLF | ROLFE RACING INC | | | SCAC4 |
| 7033 | ROLI | ROLLING STONE CARTAGE INC | | | SCAC3 |
| 7034 | ROLI | ROLLING STONE CARTAGE INC | | | SCAC4 |
| 7035 | ROLJ | ROLLMAN, J & SON, INC | | | SCAC3 |
| 7036 | ROLJ | ROLLMAN, J AND SON INC | | | SCAC4 |
| 7037 | ROLK | ROLCO TRAILERS INC | | | SCAC4 |
| 7038 | ROLL | ROLL-OFFS TRUCKING INC | | | SCAC4 |
| 7039 | ROLM | ROLLINS MOVING AND STORAGE, INC | | | SCAC3 |
| 7040 | ROLM | ROLLINS MOVING AND STORAGE, INC | | | SCAC4 |
| 7041 | ROLMA | Rolmafer | | CH | VKM |
| 7042 | ROLN | ROLAND TRUCKING COMPANY | | | SCAC3 |
| 7043 | ROLO | R O L I SYSTEMS INC | | | SCAC3 |
| 7044 | ROLO | RO-LOU TRANSPORT LTEE | | | SCAC4 |
| 7045 | ROLP | ROLAND LEASING CORP | | | SCAC3 |
| 7046 | ROLP | ROLAND LEASING CORP | | | SCAC4 |
| 7047 | ROLQ | ROLLINS TERMINALS INC | | | SCAC3 |
| 7048 | ROLS | ROSEN LIVESTOCK | | | SCAC3 |
| 7049 | ROLU | RO-LO PACIFIC LINE | | | PWRC |
| 7050 | ROLU | Ro-Lo Pacific Line | | | RSRV |
| 7051 | ROLU | RO-LO PACIFIC LINE | | | SCAC3 |
| 7052 | ROLU | ROLLTAINER | | | SCAC4 |
| 7053 | ROLV | ROUSSLANG TRANSFER | | | SCAC3 |
| 7054 | ROLX | Empire Railcar Corp. | 7/2005 (not listed) | | NAKINA |
| 7055 | ROLX | Robson Leather Co., Ltd. | added 7/1960; 4/1961-4/1970; eliminated 7/1970 | | NAKINA |
| 7056 | ROLX | Royal Manufacturing Co. of Duquesne | 1/1945-4/1947 | | NAKINA |
| 7057 | ROLX | Robson Leather Co., Ltd. | added 7/60; 4/61-4/70; eliminated 7/70 | | NRHS |
| 7058 | ROLX | *ROYAL MANUFACTURING CO. OF DUQUESNE | | | PWRC |
| 7059 | ROLX | *ROBSON LEATHER CO., LTD. | | | PWRC |
| 7060 | ROLX | +EMPIRE RAILCAR CORP. | | | PWRC |
| 7061 | ROLX | ROBSON LEATHER CO LTD | | | SCAC3 |
| 7062 | ROLX | EMPIRE RAILCAR CORPORATION | | | SCAC4 |
| 7063 | ROLY | ROLLEY MOVING & STORAGE INC | | | SCAC3 |
| 7064 | ROLY | ROLYS TRUCKING INC | | | SCAC4 |
| 7065 | ROM | Aeromar C. Por. A. | IATA: BQ, Callsign: Bravo Quebec, IATA Prefix: 926, Name changed to Aeromar Airlines | DOM | AVCODES |
| 7066 | ROM | Aeromar Airlines | IATA: BQ, Callsign: Bravo Quebec, IATA Prefix: 926, Name changed from Aeromar C. Por. A. | DOM | AVCODES |
| 7067 | ROM | Encompass Aviation, LLC | IATA: LC, Callsign: Rome, Ceased operations during 2018. | USA | AVCODES |
| 7068 | ROM | Aeromar | IATA: BQ | | ICAO1 |
| 7069 | ROMAG | RAAN - SUCURSALA ROMAG TERMO | | RO | VKM |
| 7070 | ROMB | ROBERTS MOTOR SERVICE CO | | | SCAC3 |
| 7071 | ROMDS | M&D SEA FARERS SRL | | RO | VKM |
| 7072 | ROMG | ROME'N SONS CARTAGE, INC | | | SCAC3 |
| 7073 | ROMG | ROMERO GONZALEZ, ANGEL | | | SCAC4 |
| 7074 | ROMI | RO-MAC | | | SCAC3 |
| 7075 | ROML | ROBERTS MOTOR LINES, INC | | | SCAC3 |
| 7076 | ROMN | ROMANS MOTOR FREIGHT, INC | | | SCAC3 |
| 7077 | ROMN | ROMANS MOTOR FREIGHT INC | | | SCAC4 |
| 7078 | ROMO | RODS PARCEL DELIVERY | | | SCAC3 |
| 7079 | ROMPK | ROMPAK S.R.L. | | RO | VKM |
| 7080 | ROMQ | ROME-ALBANY EXPRESS INC | | | SCAC3 |
| 7081 | ROMQ | ROSELAND MANAGEMENT CO | | | SCAC4 |
| 7082 | ROMR | ROAM TRANSPORT INC | | | SCAC4 |
| 7083 | ROMT | ROBBINS MOTOR TRANSPORTATION INC | | | SCAC3 |
| 7084 | ROMU | ROMOCEAN S.L. | | E | BIC |
| 7085 | ROMW | ROMAR TERMINAL AND WAREHOUSE CO INC | | | SCAC3 |
| 7086 | ROMX | Roy O. Martin Lumber Co., Inc. | added 10/1968; 4/1970; eliminated 1/1971 | | NAKINA |
| 7087 | ROMX | Roy O. Martin Lumber Co., Inc. | added 10/68; 4/70; eliminated 1/71 | | NRHS |
| 7088 | ROMX | ROY O. MARTIN LUMBER CO., INC. | | | PWRC |
| 7089 | ROMY | ROOMSTORE INC | | | SCAC4 |
| 7090 | RON | Air Nauru | IATA: ON, Callsign: Air Nauru, IATA Prefix: 123, Commenceds operation on 14 February 1970. Ceased operations on 18 December 2005. Relaunched as Nauru Air Corporation t/a Our Airline on 14 October 2006. Designator ON reinstated by IATA | NAU | AVCODES |
| 7091 | RON | Nauru Air Corporation t/a Our Airline | IATA: ON, IATA Prefix: 123, Nauru Air Corporation t/a Nauru Airlines w.e.f. 01 August 2014. Name changed from Air Nauru on 14 October 2005. | NAU | AVCODES |
| 7092 | RON | Nauru Air Corporation t/a Nauru Airlines | IATA: ON, IATA Prefix: 123, Name changed from Nauru Air Corporation t/a Our Airline w.e.f. 01 August 2014. | NAU | AVCODES |
| 7093 | RON | Nauru Air Corporation | IATA: ON | | ICAO1 |
| 7094 | RON | Our Airline | IATA: ON | | ICAO1 |
| 7095 | RONA | RONTRA FREIGHT INC | | | SCAC4 |
| 7096 | RONE | ROUNTREE TRUCKING COMPANY | | | SCAC3 |
| 7097 | RONE | ROSENAU EQUIPMENT COMPANY INC | | | SCAC4 |
| 7098 | RONE | Rail One S.p.A. | | IT | VKM |
| 7099 | RONF | ROANE TRANSFER | | | SCAC3 |
| 7100 | RONI | ROMANELLI & SON INC | | | SCAC4 |
