| 1 | RG | Varig S.A. (Viacao Aerea Rio-Grandense) | ICAO: VRG, Callsign: Varig, IATA Prefix: 042, Ceased operations on 20 July 2006. | BR | AVCODES |
| 2 | RG | Rotana Jet Aviation d/b/a Rotana Jet | ICAO: RJD, Callsign: Rotana, | UAE | AVCODES |
| 3 | RG | Rana Gruber | | NO | VKM |
| 4 | RGA | Region Air Pte. Ltd. | IATA: 7S, Callsign: Orchid, | SGP | AVCODES |
| 5 | RGA | Regency Aviation Services Ltd. | Callsign: Regency, | GB | AVCODES |
| 6 | RGA | Royal Ghanian Airlines Limited | Callsign: Royal Ghana, Ceased operations. | GH | AVCODES |
| 7 | RGA | Swiss Air Ambulance Ltd. (Helicopter Rescue Guard) | Callsign: Rega, | CH | AVCODES |
| 8 | RGA | Royal Ghanaian Airlines | | | ICAO1 |
| 9 | RGAB | RIGGLE, GARY TRUCKING | | | SCAC4 |
| 10 | RGAE | REGIONAL AIR EXPRESS INC | | | SCAC3 |
| 11 | RGAE | ROLLMARK TRUCKING INC | | | SCAC4 |
| 12 | RGAG | RIVERS GARAGE | | | SCAC4 |
| 13 | RGAI | REGIONAL TRUCKING CO INC | | | SCAC3 |
| 14 | RGAL | REGAL TRUCKING SERVICE CORP | | | SCAC3 |
| 15 | RGAL | REGAL TRANSPORT LTD | | | SCAC4 |
| 16 | RGAN | RANGER MARINE S A | | | SCAC3 |
| 17 | RGAN | RANGER MARINE S A | | | SCAC4 |
| 18 | RGAO | RGA TRANSPORT INC | | | SCAC4 |
| 19 | RGAP | RICHARD & GAIL AUTO TRANSPORT | | | SCAC3 |
| 20 | RGAR | REED, GARY | | | SCAC3 |
| 21 | RGAS | R G A TRANSPORTATION SYSTEMS | | | SCAC3 |
| 22 | RGAT | REGAL TRANSPORTATION INC | | | SCAC3 |
| 23 | RGAT | REGATTA TRANSPORTATION | | | SCAC4 |
| 24 | RGB | Regional Air | Callsign: Regional Bahamas, | BS | AVCODES |
| 25 | RGBD | ROYAL GAME BIRDS LTD | | | SCAC4 |
| 26 | RGBK | ROGERS TRUCKING | | | SCAC4 |
| 27 | RGBL | RIO GRANDE BULK CARRIERS INC NY | | | SCAC3 |
| 28 | RGBP | RGB TRANSPORT | | | SCAC4 |
| 29 | RGBR | ROSENBERGER, THAD TRUCKING INC | | | SCAC3 |
| 30 | RGBR | REEBIE STORAGE & MOVING CO INC | | | SCAC4 |
| 31 | RGBT | R G B TRANSPORTATION COMPANY INC | | | SCAC3 |
| 32 | RGBT | R G B TRANSPORTATION COMPANY INC | | | SCAC4 |
| 33 | RGC | Servicios Aeroes Regiomontanos | Callsign: Regiomontano, | MEX | AVCODES |
| 34 | RGC | Servicios Aereos Regiomontanos | | | ICAO1 |
| 35 | RGCA | RIGHT COOPERATIVE ASSOCIATION, THE | | | SCAC4 |
| 36 | RGCE | RIDGE-CREST ENTERPRISES INC | | | SCAC3 |
| 37 | RGCG | REGAL CARTAGE COMPANY | | | SCAC3 |
| 38 | RGCH | REGIONAL COACH | | | SCAC3 |
| 39 | RGCH | RAGAR TRANSPORTATION LTD | | | SCAC4 |
| 40 | RGCL | REGAN COACH LINES | | | SCAC3 |
| 41 | RGCO | REIMER GRAIN CO | | | SCAC3 |
| 42 | RGCP | RING CAN CORPORATION | | | SCAC3 |
| 43 | RGCR | R & G CARRIERS | | | SCAC4 |
| 44 | RGCS | REDINGER, CLIFFORD S TRUCKING | | | SCAC3 |
| 45 | RGCS | R G CRUCES INTERNACIONALES | | | SCAC4 |
| 46 | RGCT | RANEY, GARY C TRUCKING | | | SCAC3 |
| 47 | RGCT | ROCKLAND TRUCKING-N-FORESTRY | | | SCAC4 |
| 48 | RGCU | RAVA GROUP CONTAINER SERVICES | | USA | BIC |
| 49 | RGCU | MULTI GAS LIMITED | | | SCAC4 |
| 50 | RGCX | Rio Grande Chemical Ltd. | added 7/2004; 7/2005 | | NAKINA |
| 51 | RGCX | Rio Grande Chemical Sales Co. | added 4/1979; 1/1980-7/2000; eliminated 7/2004 | | NAKINA |
| 52 | RGCX | Riverside Gas Co. | added 1/1965; 7/1965; eliminated 10/1966; 10/1966 (not listed) | | NAKINA |
| 53 | RGCX | The Roth Gasoline Corp. | 8/1920-7/1923 | | NAKINA |
| 54 | RGCX | Riverside Gas Co. | added 1/65; 7/65; eliminated 10/66 | | NRHS |
| 55 | RGCX | Rio Grande Chemical Sales Co. | added 4/79; 1/80-7/2000 | | NRHS |
| 56 | RGCX | *RIVERSIDE GAS CO. | | | PWRC |
| 57 | RGCX | +RIO GRANDE CHEMICAL LTD. | | | PWRC |
| 58 | RGCX | Rio Grande Chemical Sales | | | RSRV |
| 59 | RGCX | RIVERSIDE GAS CO, THE | | | SCAC3 |
| 60 | RGCX | RIO GRANDE CHEMICAL SALES CO | | | SCAC4 |
| 61 | RGCY | REGENCY SHIPPING CORP | | | SCAC3 |
| 62 | RGD | World Air Cargo Company (International Air Company) | Callsign: Kuwait Cargo, | KWT | AVCODES |
| 63 | RGDA | ROGERS, DEAN | | | SCAC4 |
| 64 | RGDE | RENEGADE EXPRESS | | | SCAC4 |
| 65 | RGDG | RUGGLES, DOUGLAS | | | SCAC3 |
| 66 | RGDI | R G DELIVERY SERVICE INC | | | SCAC3 |
| 67 | RGDJ | RIOS, GILDARDO DE JESUS | | | SCAC4 |
| 68 | RGDL | RIGIDPLY RAFTERS INC | | | SCAC3 |
| 69 | RGDL | RIGIDPLY RAFTERS INC | | | SCAC4 |
| 70 | RGDM | RUHLIG, DAVID A FARMS | | | SCAC4 |
| 71 | RGDO | ROSS, GORDON O OF LONDON LIMITED | | | SCAC3 |
| 72 | RGDR | RIDGE DISTRIBUITON SYSTEMS INC | | | SCAC3 |
| 73 | RGDR | REFRIGERADOS OCHOA | | | SCAC4 |
| 74 | RGDT | REGAN DISTRIBUTORS TRANSPORTATION I | | | SCAC3 |
| 75 | RGE | Regioempresas, S.A. de C.V. | Callsign: Regioempresas, | MEX | AVCODES |
| 76 | RGE | HG Aviation Limited | IATA: RX, Callsign: Regent, | BD | AVCODES |
| 77 | RGE | HG Aviation Limited | Callsign: Regent, Designator RX recalled by IATA | BD | AVCODES |
| 78 | RGEB | RGE TRUCK LINES INC | | | SCAC4 |
| 79 | RGEC | REGIONAL EXPRESS COMPANY | | | SCAC3 |
| 80 | RGED | RAMOS, GERARDO | | | SCAC4 |
| 81 | RGEE | RENEGADE ENTERPRISE | | | SCAC3 |
| 82 | RGEG | REGAL EAGLE INCORPORATED | | | SCAC3 |
| 83 | RGEG | REGENCY MANUFACTURING LTD | | | SCAC4 |
| 84 | RGEI | ROGERS TRUCKING COMPANY INC | | | SCAC3 |
| 85 | RGEJ | REFRIGERATED EXPRESS LLC | | | SCAC4 |
| 86 | RGEK | R.G.E. TRUCK LINES, INC | | | SCAC3 |
| 87 | RGEM | ROGERS TRUCKING | | | SCAC3 |
| 88 | RGEN | REGENT TRUCKING INC | | | SCAC3 |
| 89 | RGEP | RANGER EXPRESS | | | SCAC4 |
| 90 | RGEQ | REGENT TRUCKING INC | | | SCAC3 |
| 91 | RGEQ | REGATTA TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 92 | RGES | ROGERS TRUCKING CO INC | | | SCAC3 |
| 93 | RGES | ROGERS SERVICE GROUP INC | | | SCAC4 |
| 94 | RGET | RUNGE TRUCKING | | | SCAC3 |
| 95 | RGEX | Royal Gorge Industries, LLC | 7/2000-7/2005 (not listed) | | NAKINA |
| 96 | RGEX | Royal Gorge Industries, LLC | Jul-00 | | NRHS |
| 97 | RGEX | ROYAL GORGE INDUSTRIES | | | PWRC |
| 98 | RGEX | Royal Gorge Industries | | | RSRV |
| 99 | RGEX | ROYAL GORGE INDUSTRIES LLC | | | SCAC4 |
| 100 | RGFA | RIVERGULF AGENCY, INC | | | SCAC3 |
