| 501 | RBTA | R B TAXI | | | SCAC3 |
| 502 | RBTB | ROBIN TRANSPORT INC | | | SCAC3 |
| 503 | RBTC | RAINBOW TOURS INC | | | SCAC3 |
| 504 | RBTD | ROBERT DOLLAR COMPANY | | | PWRC |
| 505 | RBTD | RICHARDS BROS TRANSPORT LTD | | | SCAC3 |
| 506 | RBTE | ROBERTS TRUCKING | | | SCAC3 |
| 507 | RBTF | ROBERTS, MARK A | | | SCAC3 |
| 508 | RBTG | ROBERTS TRUCKING | | | SCAC3 |
| 509 | RBTH | ROSE BROTHERS TRUCKING INC | | | SCAC3 |
| 510 | RBTH | ROBBINS TRANSPORTATION LLC | | | SCAC4 |
| 511 | RBTI | FLEETSTAR AND BENEDETTO TRUCKING CO | | | SCAC3 |
| 512 | RBTI | RODRIGUE BROTHERS TRUCKING INC | | | SCAC4 |
| 513 | RBTJ | ROBIN TRANSPORT INC | | | SCAC3 |
| 514 | RBTK | ROBCO TRUCKING CO INC | | | SCAC3 |
| 515 | RBTK | ROD BROTHERS TRANSPORTATION INC | | | SCAC4 |
| 516 | RBTL | REIMER BROS TRUCKING LTD | | | SCAC4 |
| 517 | RBTM | ROBERTS TRANSPORT (A CORP) | | | SCAC3 |
| 518 | RBTN | REBA TRUCKING | | | SCAC4 |
| 519 | RBTO | R E B TRANSPORTATION | | | SCAC3 |
| 520 | RBTQ | ROSS BROTHERS TRANSPORTATION | | | SCAC3 |
| 521 | RBTR | ROBERTSON, JOHN R TRUCK INC | | | SCAC3 |
| 522 | RBTR | R & B TRANSPORTATION | | | SCAC4 |
| 523 | RBTS | R B TRANSIT LTEE | | | SCAC3 |
| 524 | RBTS | RBT EXPRESS | | | SCAC4 |
| 525 | RBTT | ROBERTSON TRANSPORTS INC | | | SCAC3 |
| 526 | RBTT | R & B TRUCKING INC | | | SCAC4 |
| 527 | RBTU | RABBITRANS | | PL | BIC |
| 528 | RBTW | ROBINSON TRANSPORTATION SERVICES | | | SCAC3 |
| 529 | RBTW | ROBINSON, C H WORLDWIDE | | | SCAC4 |
| 530 | RBTX | Rogers Brown Transportation Corp. | 8/1920 | | NAKINA |
| 531 | RBTX | *ROGERS BROWN TRANSPORTATION CORP. | | | PWRC |
| 532 | RBTX | *RUBICON CHEMICAL COMPANY | | | PWRC |
| 533 | RBTX | RUBICON CHEMICAL COMPANY | | | SCAC4 |
| 534 | RBU | Airbus France | Callsign: Corvette, | F | AVCODES |
| 535 | RBU | Airbus France | IATA: 4Y | | ICAO1 |
| 536 | RBUA | RATHBOURNE EXPRESS INC | | | SCAC4 |
| 537 | RBUD | ROSEBUD TRANSPORT SERVICES | | | SCAC3 |
| 538 | RBUH | ROSENBLUTH TRAVEL AGENCY INC | | | SCAC3 |
| 539 | RBUI | RBS BULK SYSTEMS INC | | | SCAC4 |
| 540 | RBUK | R & B TRUCKING | | | SCAC3 |
| 541 | RBUL | ROHRER, BULL TRUCKING | | | SCAC3 |
| 542 | RBUN | ROCKBRUNE HOLDINGS | | | SCAC4 |
| 543 | RBUR | ROAD BURNERS TOURS INC | | | SCAC3 |
| 544 | RBUS | ROHRER BUS SERVICE | | | SCAC3 |
| 545 | RBUS | ROHRER BUS SERVICE | | | SCAC4 |
| 546 | RBUT | ROYAL BLUE TOURS INC | | | SCAC3 |
| 547 | RBUV | ROSITA BUS SERVICE | | | SCAC3 |
| 548 | RBV | Air Roberval | Callsign: Air Roberval, | CDN | AVCODES |
| 549 | RBV | Air Roberval | | | ICAO1 |
| 550 | RBVA | RED BALL VAN & STORAGE OF GEORGIA | | | SCAC3 |
| 551 | RBVC | RELIABLE SERVICES INC | | | SCAC3 |
| 552 | RBVI | RED BALL VAN & STORAGE INC | | | SCAC3 |
| 553 | RBVN | RED BALL VAN & STORAGE OF CALIFORNI | | | SCAC3 |
| 554 | RBVQ | ROBIN VAN & STG INC | | | SCAC3 |
| 555 | RBVS | RBA TRANSPORTATION SERVICES INC | | | SCAC4 |
| 556 | RBVW | RED BALL VAN & STORAGE OF WASHINGTO | | | SCAC3 |
| 557 | RBW | Shandong Airlines Rainbow Jet Co. Ltd. | Callsign: Cai Hong, | PRC | AVCODES |
| 558 | RBW | Shandong Airlines Rainbow Jet | | | ICAO1 |
| 559 | RBW | Burlington Northern R.R. Co. | eliminated 4/1995 | | NAKINA |
| 560 | RBW | Burlington Northern Express Co. | 1/1994 | | NAKINA |
| 561 | RBW | Burlington Northern R.R. Co. | added 7/1981 | | NAKINA |
| 562 | RBW | Burlington Northern Inc. | added 10/1975; 1/1980; eliminated 7/1981 | | NAKINA |
| 563 | RBW | Burlington Northern Inc. | 1/80; eliminated 7/81 | | NRHS |
| 564 | RBW | Burlington Northern R.R. Co. | added 7/81 | | NRHS |
| 565 | RBW | Burlington Northern Express Co. | Jan-94 | | NRHS |
| 566 | RBW | Burlington Northern R.R. Co. | eliminated 4/95 | | NRHS |
| 567 | RBW | BURLINGTON NORTHERN RAILROAD CO | | | PWRC |
| 568 | RBW | BNSF Railway | | | RSRV |
| 569 | RBWA | RAINBOW CARRIERS INC | | | SCAC3 |
| 570 | RBWA | ROBINSON, WM STABLES INC | | | SCAC4 |
| 571 | RBWB | RBW LOGISTICS CO INC | | | SCAC4 |
| 572 | RBWC | RBW LOGISTICS CORP | | | SCAC4 |
| 573 | RBWD | RAINBOW TRANSPORT LTD | | | SCAC4 |
| 574 | RBWH | RALEIGH BONDED WAREHOUSE INC | | | SCAC3 |
| 575 | RBWI | RAINBOW TRANSPORT INC | | | SCAC3 |
| 576 | RBWK | RAINBOW TRUCKING | | | SCAC3 |
| 577 | RBWL | ROBERTS, WALTER L | | | SCAC3 |
| 578 | RBWL | RAINBOW TRAILERS INC | | | SCAC4 |
| 579 | RBWM | RAINBOW MESSENGER SERVICE, INC | | | SCAC3 |
| 580 | RBWN | R B W INC | | | SCAC3 |
| 581 | RBWN | R B W INC | | | SCAC4 |
| 582 | RBWO | RAINBOW TRANSPORTATION INC | | | SCAC4 |
| 583 | RBWP | RAINBOW TRANSPORTATION SERVICES INC | | | SCAC3 |
| 584 | RBWR | ROBINSON, C H WORLDWIDE (RAILCAR DI | | | SCAC4 |
| 585 | RBWS | RAINBOW SHIPMANAGEME | | | SCAC4 |
| 586 | RBWT | ROBERTSON-WILLIAMS TRANSPORT INC | | | SCAC3 |
| 587 | RBWV | RBW LOGISTICS TRANSPORTATION LLC | | | SCAC4 |
| 588 | RBWX | Western Fruit Express Co. | added 10/1955; 10/1957-1/1980; eliminated 1/1981 | | NAKINA |
| 589 | RBWX | Western Fruit Express Co. | 10/57-1/80; eliminated 1/81 | | NRHS |
| 590 | RBWX | WESTERN FRUIT EXPRESS CO. | | | PWRC |
| 591 | RBWX | Western Fruit Express | | | RSRV |
| 592 | RBX | ArubaExel | Callsign: Aruba, Ceased operations | ARU | AVCODES |
| 593 | RBX | Arubaexel | | | ICAO1 |
| 594 | RBX | RINGLING BROTHERS, BARNUM & BAILEY CIRCUS | | | PWRC |
| 595 | RBXA | RED BARN TRANSPORTATION INC | | | SCAC4 |
| 596 | RBXC | TRANS DIV ASSIGNMENT - BOX CAR POOLING | | | PWRC |
| 597 | RBXE | ROBERTS EXPRESS OIL | | | SCAC4 |
| 598 | RBXG | ROBERTS TRANSPORT INC | | | SCAC4 |
| 599 | RBXI | RED BARON EXPRESS INC | | | SCAC3 |
| 600 | RBXN | RED BIRD EXPRESS INC | | | SCAC3 |
