| 301 | RBLJ | RB LOGISTICS | | | SCAC4 |
| 302 | RBLL | RELIABLE LOGISTICS LLC | | | SCAC4 |
| 303 | RBLM | ROBINSON LUMBER CO | | | SCAC4 |
| 304 | RBLN | ROWAN BUS LINES | | | SCAC3 |
| 305 | RBLN | REBEL TRANSPORTATION INC | | | SCAC4 |
| 306 | RBLO | ROBELLO AND SONS TRANSPORTATION | | | SCAC3 |
| 307 | RBLP | REBEL TRANSPORTATION | | | SCAC3 |
| 308 | RBLP | ROBERTS LANDSCAPING COMPANY INC | | | SCAC4 |
| 309 | RBLQ | RELIABLE AUTO TRANSPORT | | | SCAC3 |
| 310 | RBLR | ROBINSON, LEROY G | | | SCAC3 |
| 311 | RBLS | ROBLES, ED TRUCKING | | | SCAC3 |
| 312 | RBLT | ROBINSON, C H WORLDWIDE (LTL DIVISI | | | SCAC4 |
| 313 | RBLUE | Royal Blue Coach Services | | GB | TRAFFIC |
| 314 | RBLV | RED BALL VAN LINES INC | | | SCAC3 |
| 315 | RBLW | R B L WISCONSIN INC | | | SCAC3 |
| 316 | RBLW | ROBERTS BROS LUMBER CO INC | | | SCAC4 |
| 317 | RBLX | Brent C. Lewis | 7/2000-7/2005 (not listed) | | NAKINA |
| 318 | RBLX | Brent C. Lewis | Jul-00 | | NRHS |
| 319 | RBLX | BRENT C. LEWIS | | | PWRC |
| 320 | RBLX | Brent C. Lewis | | | RSRV |
| 321 | RBLX | BRENT C LEWIS | | | SCAC4 |
| 322 | RBLY | RAYLIN BUS LINES | | | SCAC3 |
| 323 | RBLY | ROBLES TRUCKING | | | SCAC4 |
| 324 | RBM | | City: Merseburg | D | TRAFFIC |
| 325 | RBMB | R B T LIMITED | | | SCAC4 |
| 326 | RBMC | ROBINSON MOTORCYCLE LTD | | | SCAC4 |
| 327 | RBMD | ROBERTS, MARK D | | | SCAC3 |
| 328 | RBMD | ROBINSON MAPLE PRODUCTS | | | SCAC4 |
| 329 | RBMF | RED BALL MOTOR FREIGHT INC | | | PWRC |
| 330 | RBMF | RED BALL MOTOR FREIGHT INC | | | SCAC3 |
| 331 | RBMG | RED BALL MOVING & STORAGE LLC | | | SCAC4 |
| 332 | RBMI | RUBYMAR LIMITED | | | SCAC4 |
| 333 | RBML | RAINBOW MOTOR LINES | | | SCAC3 |
| 334 | RBML | RBM HOLD SOLUTIONS | | | SCAC4 |
| 335 | RBMN | Reading Blue Mountain & Northern R.R. Co. | 1/1994; added 4/2000; 7/2000; eliminated 7/2000; 7/2005; added 1/2009; eliminated 4/2009 | | NAKINA |
| 336 | RBMN | Reading Blue Mountain & Northern R.R. Co. | 1/94; added 4/2000; 7/2000; eliminated 7/2000 | | NRHS |
| 337 | RBMN | READING BLUE MOUNTAIN & NORTHERN RAILROAD COMPANY | | | PWRC |
| 338 | RBMN | Reading Blue Mountain and Northern Railroad | | | RSRV |
| 339 | RBMN | READING BLUE MOUNTAIN & NORTHERN RA | | | SCAC3 |
| 340 | RBMN | READING BLUE MOUNTAIN & NORTHERN RA | | | SCAC4 |
| 341 | RBMN | Reading Blue Mountain & Northern Railroad Company | | USA | TRAFFIC |
| 342 | RBMO | R B S INC | | | SCAC3 |
| 343 | RBMO | R B S INC | | | SCAC4 |
| 344 | RBMQ | RED BALL MOVING AND STORAGE OF | | | SCAC4 |
| 345 | RBMR | RBM REFRIGERATED DISTRIBUTION COMPA | | | SCAC3 |
| 346 | RBMR | RUBY MARINE INCORPORATED | | | SCAC4 |
| 347 | RBMS | ROSSI BROS MOTOR SERVICE, INC | | | SCAC3 |
| 348 | RBMS | RBM CARRIERS INC | | | SCAC4 |
| 349 | RBMT | RBM TRUCKING | | | SCAC4 |
| 350 | RBMU | BOURGEY MONTREUIL ROUTE | | | SCAC3 |
| 351 | RBMV | ROBERSON MOVING & STORAGE | | | SCAC3 |
| 352 | RBMV | REIMER BUILDING MOVERS | | | SCAC4 |
| 353 | RBN | Red Baron Aviation, Inc. | Callsign: Red Baron, | USA | AVCODES |
| 354 | RBN | Red Baron Aviation | | | ICAO1 |
| 355 | RBNB | RUBIN, BEN EXPRESS | | | SCAC3 |
| 356 | RBNC | ROBIN CARTAGE INC | | | SCAC3 |
| 357 | RBND | ROBINSONS DELIVERY SERVICE INC | | | SCAC3 |
| 358 | RBND | ROBINSONS DELIVERY SERVICE INC | | | SCAC4 |
| 359 | RBNE | ROBIN EXPRESS INC | | | SCAC3 |
| 360 | RBNE | ROBIN EXPRESS INC | | | SCAC4 |
| 361 | RBNG | R B & G CO INC | | | SCAC3 |
| 362 | RBNI | ROBINSON, DALE TRUCKING INC | | | SCAC3 |
| 363 | RBNJ | ROBINS, JONATHAN B TRANSPORT CO INC | | | SCAC3 |
| 364 | RBNK | ROBINSON TRUCKING | | | SCAC3 |
| 365 | RBNM | ROBINSONS MELROSE EXPRESS | | | SCAC3 |
| 366 | RBNO | ROBINSON TRANSFER | | | SCAC3 |
| 367 | RBNO | ROBINSON TRANSFER INC | | | SCAC4 |
| 368 | RBNP | ROBINSON TRANSPORT INC | | | SCAC3 |
| 369 | RBNP | ROBINSON TRANSPORT INC | | | SCAC4 |
| 370 | RBNQ | RABIN & SHOOBS INC | | | SCAC3 |
| 371 | RBNQ | ROBINSON TRUCKING | | | SCAC4 |
| 372 | RBNR | RED BLUFF AND REDDING TRUCKING | | | SCAC3 |
| 373 | RBNS | ROBINS TRANSFER COMPANY, INC | | | SCAC3 |
| 374 | RBNT | ROBINSON TRANSPORTATION | | | SCAC4 |
| 375 | RBNU | RECKITT BENCKISER LIMITED | | | SCAC4 |
| 376 | RBNX | Fruit Growers Express Co. | 7/1954-1/1980; eliminated 10/1989; 1/1994 (not listed) | | NAKINA |
| 377 | RBNX | National Car Co. | 1/1950-1/1952 | | NAKINA |
| 378 | RBNX | National Car Co. | Jan-52 | | NRHS |
| 379 | RBNX | Fruit Growers Express Co. | 10/57-1/80; eliminated 10/89; 1/94 | | NRHS |
| 380 | RBNX | FRUIT GROWERS EXPRESS CO, (NATIONAL CAR CO.) | | | PWRC |
| 381 | RBNX | Fruit Growers Express | | | RSRV |
| 382 | RBO | Rainbow Cargo Express | Callsign: Race, | GH | AVCODES |
| 383 | RBO | Regionalbus Ostbayern GmbH | | D | TRAFFIC |
| 384 | RBOA | ROBERTSON, OSCAR & ASSOCIATES INC | | | SCAC3 |
| 385 | RBOB | ROTHWELL, BOB | | | SCAC4 |
| 386 | RBOC | RAINBOW CARRIERS INC | | | SCAC3 |
| 387 | RBOC | ROBERT B OUR CO INC | | | SCAC4 |
| 388 | RBOD | ROCHELLE-ASHTON-BYRON OREGON READY | | | SCAC3 |
| 389 | RBOF | RELIABLE ON TIME FREIGHT | | | SCAC4 |
| 390 | RBOH | ROBO TRUCKING INC | | | SCAC3 |
| 391 | RBOH | RED BALL MOVING AND STORAGE OF | | | SCAC4 |
| 392 | RBOI | ROBO TRUCKING INC | | | SCAC3 |
| 393 | RBOI | ROBERTSON OIL CO INC | | | SCAC4 |
| 394 | RBOL | RAINBOW LEASING INC | | | SCAC3 |
| 395 | RBOL | ROBINSON OIL | | | SCAC4 |
| 396 | RBON | ROBINSONS TRUCKING | | | SCAC3 |
| 397 | RBOR | RAINBOW TOURS | | | SCAC3 |
| 398 | RBOR | RAMBO TRANSPORT LLC | | | SCAC4 |
| 399 | RBOS | ROBERTOS LIMOUSINE SERVICE INC | | | SCAC3 |
| 400 | RBOT | RAINBOW TRANSPORT, INC | | | SCAC3 |
