| 101 | RLCZ | ROPER LUMBER CO. | | | PWRC |
| 102 | RLD | RAS Fluggeselischaft mbH | IATA: RW, Callsign: Rheinland, IATA Prefix: 586, Ceased operations on 11 January 2002. | D | AVCODES |
| 103 | RLD | Rheinland Air Service | IATA: RW, IATA Prefix: 586, | D | AVCODES |
| 104 | RLDB | RALEY, DELBERT TRUCKING | | | SCAC3 |
| 105 | RLDC | ROLLINS DEDICATED CARRIAGE SERVICES | | | SCAC3 |
| 106 | RLDC | RANGELAND COOPERATIVES INC | | | SCAC4 |
| 107 | RLDE | R & L DRAY CO INC | | | SCAC4 |
| 108 | RLDF | ROMELI LOGISTICS INC | | | SCAC4 |
| 109 | RLDG | RED LINE DISTRIBUTION GUILD INC | | | SCAC3 |
| 110 | RLDI | R & L DISTRIBUTORS | | | SCAC3 |
| 111 | RLDI | RLD TRANSPORTATION INC | | | SCAC4 |
| 112 | RLDK | ROLANDS TRUCKING | | | SCAC3 |
| 113 | RLDM | REAL DESROCHES | | | SCAC4 |
| 114 | RLDN | RICHLAND TRANSPORTATION (A DIV OF W | | | SCAC3 |
| 115 | RLDN | RELIABLE DELIVERY SOLUTIONS | | | SCAC4 |
| 116 | RLDO | ROWLAND TRANSPORTATION INC | | | SCAC3 |
| 117 | RLDP | RAIL DIRECT TRANSPORTATION COMPANY | | | SCAC4 |
| 118 | RLDQ | RELDA CARTAGE CO | | | SCAC3 |
| 119 | RLDR | R & L DELIVERY SERVICE | | | SCAC3 |
| 120 | RLDS | RELIABLE DELIVERY SERVICE | | | SCAC4 |
| 121 | RLDT | ROLAND TRANSPORT INC | | | SCAC3 |
| 122 | RLDT | ROLAND TRANSPORT INC | | | SCAC4 |
| 123 | RLDU | RELOAD LOGISTICS DMCC | | ZA | BIC |
| 124 | RLDV | RELIABLE DELIVERY | | | SCAC3 |
| 125 | RLDX | R & L DEVELOPMENT CO. | | | PWRC |
| 126 | RLDX | R & L DEVELOPMENT COMPANY | | | SCAC4 |
| 127 | RLDY | R & L DELIVERY | | | SCAC3 |
| 128 | RLE | Rico Linhas Aéreas | IATA: C7 | | ICAO1 |
| 129 | RLEA | R & E INTERMODAL EXPRESS INC | | | SCAC3 |
| 130 | RLEC | RED LION EXPRESS CO | | | SCAC3 |
| 131 | RLED | ROBERTSON, LOUIS EDWARD | | | SCAC3 |
| 132 | RLEH | RALEIGH TRUCKING SERVICE INC | | | SCAC3 |
| 133 | RLEI | RELIANT LOGISTICS INC | | | SCAC4 |
| 134 | RLEO | REGO'S LOWBED EQUIPMENT TRANSPORT | | | SCAC4 |
| 135 | RLER | REX TRANSPORTATION COMPANY | | | SCAC4 |
| 136 | RLES | RED LINE EXPRESS INC | | | SCAC3 |
| 137 | RLET | RALEYS TOWING | | | SCAC3 |
| 138 | RLET | READ LINE ENT LTD | | | SCAC4 |
| 139 | RLEV | RICH-LEE VANS INC | | | SCAC3 |
| 140 | RLEX | Republic Locomotives, Inc. | 7/2005 (not listed) | | NAKINA |
| 141 | RLEX | Relco Locomotives, Inc. | 7/2000 (not listed) | | NAKINA |
| 142 | RLEX | Republic Locomotives, Inc. | Jul-00 | | NRHS |
| 143 | RLEX | REPUBLIC LOCOMOTIVES, INC. [RELCO LOCOMOTIVES, INC.] | | | PWRC |
| 144 | RLEX | Relco Locomotives | | | RSRV |
| 145 | RLEY | RILEY, DENNIS G | | | SCAC3 |
| 146 | RLFD | RELIANCE FINANCE CO LTD | | | SCAC4 |
| 147 | RLFE | RATCLIFFE & SONS | | | SCAC4 |
| 148 | RLFF | ROLOFF TRUCKING | | | SCAC3 |
| 149 | RLFG | RELIABLE FREIGHT SERVICES | | | SCAC3 |
| 150 | RLFH | ROLLINS FURNERAL HOME INC | | | SCAC3 |
| 151 | RLFI | RED LINE FREIGHT CARRIERS INC | | | SCAC4 |
| 152 | RLFJ | RAMIREZ LINAREZ, FRANCISCO JAVIER | | | SCAC4 |
| 153 | RLFL | ROL-LAND FARMS LTD | | | SCAC4 |
| 154 | RLFM | RALSTON FARMS | | | SCAC4 |
| 155 | RLFN | REMITALL FARMS INC | | | SCAC4 |
| 156 | RLFQ | RUSH FREIGHT LINES INC | | | SCAC3 |
| 157 | RLFR | RETAIL TRANSFER SERVICE INC | | | SCAC3 |
| 158 | RLFT | RED LINE FREIGHT SYSTEMS | | | SCAC3 |
| 159 | RLFT | REEEL FUEL TRANSPORTATION | | | SCAC4 |
| 160 | RLFU | ROGERIO LEAL & FILHOS LDA | | | SCAC4 |
| 161 | RLFV | R & L GLOBAL SERVICES | | | SCAC4 |
| 162 | RLG | Regionalverkehr Ruhr-Lippe GmbH | Hamm | D | privat-bahn.de |
| 163 | RLG | Regionalverkehr Ruhr-Lippe GmbH Soest u. Hochsauerland | | D | TRAFFIC |
| 164 | RLG | Regionalverkehr Ruhr-Lippe | | DE | VKM |
| 165 | RLGB | RILEPH GLOBAL TRANSPORT INC | | | SCAC4 |
| 166 | RLGC | Railogic | | DE | VKM |
| 167 | RLGG | RESCIGNO LOGISTICS GROUP LLC | | | SCAC4 |
| 168 | RLGI | RESOURCE LOGISTICS INTERNATIONAL | | | SCAC4 |
| 169 | RLGK | RADOM LOGIC GROUP INC | | | SCAC4 |
| 170 | RLGM | RLG INTERMODAL COMPANY | | | SCAC4 |
| 171 | RLGN | RaiLink Canada Ltd, d/b/a RaiLink Mackenzie Northern | added 7/1998; 7/2000; eliminated 10/2004; 7/2005 | | NAKINA |
| 172 | RLGN | RaiLink Canada Ltd, d/b/a RaiLink Mackenzie Northern | added 7/98; 7/2000 | | NRHS |
| 173 | RLGN | RAILINK CANADA LIMITED, DBA MACKENZIE NORTHERN RAILWAY | | | PWRC |
| 174 | RLGN | Mackenzie Northern Railway | | | RSRV |
| 175 | RLGO | ROLLING OATS LTD | | | SCAC3 |
| 176 | RLGO | ROGERS LOGISTICS GROUP, THE | | | SCAC4 |
| 177 | RLGP | RAMAR TRANSPORTATION & LOGISTICS GR | | | SCAC4 |
| 178 | RLGQ | RDW LOGISTICS INC | | | SCAC4 |
| 179 | RLGR | RILINGER TRUCKING | | | SCAC3 |
| 180 | RLGS | REICH LOGISTIC SERVICES INC | | | SCAC4 |
| 181 | RLGT | RAWLINGS TRUCKING INC | | | SCAC3 |
| 182 | RLGU | REAL LOGISTICS SP. Z O.O. SP.K. | | PL | BIC |
| 183 | RLGX | Roberto de la Garza y Hnos, S.A. | added 1/1956; 10/1957-1/1980 | | NAKINA |
| 184 | RLGX | Roberto de la Garza y Hnos, S.A. | 10/57-1/80 | | NRHS |
| 185 | RLGX | *ROBERTO DE LA GARZA Y HNOS, SA | | | PWRC |
| 186 | RLGX | +RAIL LOGIX, LP | | | PWRC |
| 187 | RLGX | Rail Logix | | | RSRV |
| 188 | RLGX | RAIL LOGIX LP | | | SCAC4 |
| 189 | RLGX | Rail Logix | | USA | TRAFFIC |
| 190 | RLH | Ruili Airlines Co., Ltd. | IATA: DR, Callsign: Sendi, Name changed to Sunan Ruili Airlines Co., Ltd. On 18 October 2021. | PRC | AVCODES |
| 191 | RLH | Sunan Ruili Airlines Co., Ltd. | IATA: DR, Callsign: Sendi, Name changed from Ruili Airlines Co., Ltd. On 18 October 2021. | PRC | AVCODES |
| 192 | RLHD | R L & H DISTRIBUTING CO INC | | | SCAC3 |
| 193 | RLHH | RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | added 7/1998; 7/2000; eliminated 1/2004; 7/2005 | | NAKINA |
| 194 | RLHH | RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | added 7/98; 7/2000 | | NRHS |
| 195 | RLHH | RAILINK CANADA LIMITED d/b/a RAILINK SOUTHERN ONTARIO | | | PWRC |
| 196 | RLHH | Southern Ontario Railway (Genesee & Wyoming) | | | RSRV |
| 197 | RLHI | RLH TRUCKING INC | | | SCAC4 |
| 198 | RLHL | ROLLING HILLS TRUCKING | | | SCAC3 |
| 199 | RLHQ | RAIL HIGHWAY SERVICES INC | | | SCAC3 |
| 200 | RLHS | R & L HYDRAULIC SERVICE | | | SCAC3 |
