| 101 | RBCS | BNSF Ry. Co. | added 4/2005; 7/2005 | | NAKINA |
| 102 | RBCS | Burlington Northern R.R. Co. | added 4/1982; 1/1994; eliminated 4/2005 | | NAKINA |
| 103 | RBCS | The Colorado and Southern Ry. Co. | 1/1975-1/1980; eliminated 4/1982 | | NAKINA |
| 104 | RBCS | Colorado & Southern Ry. Co. | 4/1961-4/1970 | | NAKINA |
| 105 | RBCS | Colorado & Southern Ry. Co. | 4/61-4/70 | | NRHS |
| 106 | RBCS | The Colorado and Southern Ry. Co. | 1/75-1/80; eliminated 4/82 | | NRHS |
| 107 | RBCS | Burlington Northern R.R. Co. | added 4/82; 1/94 | | NRHS |
| 108 | RBCS | BNSF [BURLINGTON NORTHERN RAILROAD CO.; COLORADO & SOUTHERN RY.] | | | PWRC |
| 109 | RBCS | Rail-Bridge Corporation (BNSF Railway) | | | RSRV |
| 110 | RBCS | RELIANCE BULK CARRIERS LLC | | | SCAC4 |
| 111 | RBCU | RB HOLDING B.V. | | NL | BIC |
| 112 | RBCU | (PCBX) RAILBRIDGE CORPORATION | | | PWRC |
| 113 | RBCU | Rail-Bridge Corporation (RB Holding) | | | RSRV |
| 114 | RBCU | THE RAIL-BRIDGE CORP | | | SCAC3 |
| 115 | RBCU | RB HOLDING BV | | | SCAC4 |
| 116 | RBCX | The Rail-Bridge Corp. | added 10/1990; 1/1994; 7/2000-7/2005 (not listed) | | NAKINA |
| 117 | RBCX | The Rail-Bridge Corp. | added 10/90; 1/94-7/2000 | | NRHS |
| 118 | RBCX | RAIL-BRIDGE CORPORATION | | | PWRC |
| 119 | RBCX | Rail-Bridge Corporation | | | RSRV |
| 120 | RBCX | RAILBRIDGE CORPORATION | | | SCAC4 |
| 121 | RBCY | R & B COMPANY | | | SCAC3 |
| 122 | RBD | Trans World Express, Inc. | Callsign: Red Bird, | USA | AVCODES |
| 123 | RBD | CHC Helicopters Canada Inc | Callsign: Redbird, | CDN | AVCODES |
| 124 | RBD | Trans World Express | | | ICAO1 |
| 125 | RBDB | ROMBIS, DEBRA | | | SCAC4 |
| 126 | RBDC | RAIL-BRIDGE CORPORATION, THE | | | SCAC3 |
| 127 | RBDC | RBD EXPRESS INC | | | SCAC4 |
| 128 | RBDE | ROBIDEAUS EXPRESS | | | SCAC3 |
| 129 | RBDE | ROBARDS EXPRESS INC | | | SCAC4 |
| 130 | RBDI | REBEL DELIVERY SERVICE | | | SCAC3 |
| 131 | RBDL | ROBINSON, DON SAND AND GRAVEL INC | | | SCAC3 |
| 132 | RBDM | RUBY DOME INC | | | SCAC3 |
| 133 | RBDM | ROBICHAUD, D M ASSOCIATES LTD | | | SCAC4 |
| 134 | RBDP | ROBIDEAUX EXPRESS | | | SCAC4 |
| 135 | RBDQ | ROBERDEAU VAN & STORAGE | | | SCAC3 |
| 136 | RBDR | RBD TRANSPORT | | | SCAC4 |
| 137 | RBDS | ROBERTS DELIVERY SERVICE INC | | | SCAC3 |
| 138 | RBDS | RABAS, DAVE & SON INC | | | SCAC4 |
| 139 | RBDU | RABANCO COMPANIES | | | SCAC4 |
| 140 | RBDV | ROBERTS DELIVERIES | | | SCAC3 |
| 141 | RBDW | RBD EXPRESS TWO (2) LLC | | | SCAC4 |
| 142 | RBE | Redbus Executive Aviation | Callsign: Redbus, | GB | AVCODES |
| 143 | RBE | Air Rum Benin | Callsign: Rum Benin, | DY | AVCODES |
| 144 | RBE | Aur Rum Benin | | | ICAO1 |
| 145 | RBE | Rheinisch-Bergische-Eisenbahn GmbH | Mettmann (Connex-Gruppe > Veolia Verkehr) | D | privat-bahn.de |
| 146 | RBE | Rheinisch-Bergische Eisenbahn-Gesellschaft mbH | | DE | VKM |
| 147 | RBEA | R & B EXPRESS INC | | | SCAC4 |
| 148 | RBEC | R B EXPRESS INC | | | SCAC4 |
| 149 | RBEE | RBX INC | | | SCAC3 |
| 150 | RBEE | RBX INC | | | SCAC4 |
| 151 | RBEG | ROBERT, GERALD TRUCKING INC | | | SCAC3 |
| 152 | RBEH | RELIABLE CONTAINER CORP | | | SCAC4 |
| 153 | RBEI | ROLLING B ENTERPRISES INC | | | SCAC4 |
| 154 | RBEJ | RAINBOW EXPRESS INC | | | SCAC3 |
| 155 | RBEK | ROBERTS TRUCKING | | | SCAC3 |
| 156 | RBEK | ROBERTS TRUCKING | | | SCAC4 |
| 157 | RBEL | RABEL, ELMER M | | | SCAC3 |
| 158 | RBEM | ROBERTS, E & M INC | | | SCAC3 |
| 159 | RBEM | REASONABLE ENT INC | | | SCAC4 |
| 160 | RBEN | R & B ENTERPRISES INC | | | SCAC3 |
| 161 | RBEN | RUBENS TRANSPORTATION | | | SCAC4 |
| 162 | RBEO | ROBERTS, A B OIL COMPANY | | | SCAC3 |
| 163 | RBEQ | REEBIE STORAGE & MOVING COMPANY INC | | | SCAC3 |
| 164 | RBEQ | RB EQUIPMENT CORPORATION | | | SCAC4 |
| 165 | RBER | ROBERTSON TRUCKING | | | SCAC3 |
| 166 | RBES | R & B ENTERPRISES | | | SCAC4 |
| 167 | RBET | ROBERTS TRUCKING INC | | | SCAC3 |
| 168 | RBET | ROBERTS TRUCKING INC | | | SCAC4 |
| 169 | RBEU | RAT LOGISTICS GMBH | | D | BIC |
| 170 | RBEU | RAT BUZZATTI GMBH | | | SCAC4 |
| 171 | RBEW | ROBIN EXPRESS CO | | | SCAC3 |
| 172 | RBFE | R B FREIGHT SERVICE | | | SCAC4 |
| 173 | RBFH | RAINBOW FREIGHT INC | | | SCAC3 |
| 174 | RBFH | R & B FRESH EXPRESS INC | | | SCAC4 |
| 175 | RBFI | ROBBINS FERTILIZER | | | SCAC3 |
| 176 | RBFI | ROMMELMAN BROS FARMS INC | | | SCAC4 |
| 177 | RBFK | RIVER BEND FUELS INC | | | SCAC4 |
| 178 | RBFL | ROBERTS, F L & CO INC | | | SCAC4 |
| 179 | RBFM | RIDDEL-BURRIS FARMS INC | | | SCAC3 |
| 180 | RBFM | RAINBOW FARMS LTD | | | SCAC4 |
| 181 | RBFN | R B FURNITURE | | | SCAC3 |
| 182 | RBFN | ROSARITO BAJA FURNITURE S A | | | SCAC4 |
| 183 | RBFO | RIVERBEND FARMS (ONTARIO) LTD | | | SCAC4 |
| 184 | RBFQ | RED BLUFF TRANSFER & STG | | | SCAC3 |
| 185 | RBFS | RELIABLE FREIGHT SYSTEMS | | | SCAC3 |
| 186 | RBFW | ROBERT FORWARDING COMPANY INC | | | SCAC3 |
| 187 | RBG | Air Arabia Egypt | IATA: E5, Callsign: Arabia Egypt, IATA Prefix: 844, | ET | AVCODES |
| 188 | RBG | Rennsteigbahn GmbH & Co KG | Schmiedefeld | D | privat-bahn.de |
| 189 | RBG | Regental Bahnbetriebs GmbH | Viechtach | D | privat-bahn.de |
| 190 | RBG | Regental Bahnbetriebs-GmbH | | D | TRAFFIC |
| 191 | RBG | Regental Bahnbetriebs GmbH | | DE | VKM |
| 192 | RBGA | ROBBEN, GARY & ASSOCIATES INC | | | SCAC3 |
| 193 | RBGA | RIGEL BEREEDERUNGS GMBH & CO KG MT | | | SCAC4 |
| 194 | RBGB | ROBBINS, G B TRANSFER INC | | | SCAC3 |
| 195 | RBGB | ROBERTS-GIBSON INC | | | SCAC4 |
| 196 | RBGD | ROBERTS, GERALD D | | | SCAC3 |
| 197 | RBGE | R B TRANSPORTATION | | | SCAC3 |
| 198 | RBGH | RIGEL BEREEDERUNGS GMBH & CO KG MT | | | SCAC4 |
| 199 | RBGI | R BROKERAGE INC | | | SCAC3 |
| 200 | RBGI | RAINBOW GREENHOUSES INC | | | SCAC4 |
