| 601 | RETW | RELIABLE TOWING COMPANY | | | SCAC3 |
| 602 | RETW | ROWE, E TRUCKING LTD | | | SCAC4 |
| 603 | RETX | R.E. Thorpe & Co. | 7/1932-7/1935 | | NAKINA |
| 604 | RETX | R. E. THORPE & CO. | | | PWRC |
| 605 | RETY | R & A EXPRESS TRUCKING INC | | | SCAC4 |
| 606 | RETZ | REILLY TAR | | | PWRC |
| 607 | REU | Air Austral | IATA: UU, Callsign: Reunion, IATA Prefix: 760, Formerly Air Reunion | REU | AVCODES |
| 608 | REU | Air Reunion | IATA: UU, Callsign: Air Reunion, IATA Prefix: 760, Name changed from Reunion Air Service | REU | AVCODES |
| 609 | REU | Reunion Air Service | Name changed to Air Reunion | REU | AVCODES |
| 610 | REU | Air Austral | IATA: UU | | ICAO1 |
| 611 | REUA | REUTER, ART ENTERPRISES | | | SCAC3 |
| 612 | REUE | RED TRUCK LINES INC | | | SCAC3 |
| 613 | REUI | REUNION TRANSPORT INC | | | SCAC3 |
| 614 | REUL | RECYCLING UNLIMITED | | | SCAC3 |
| 615 | REUN | REUNION TRANSPORTATION SERVICES CO | | | SCAC3 |
| 616 | REUP | RUSSELL ENTERPRISE | | | SCAC3 |
| 617 | REUR | REUSABLE RESOURCES INC | | | SCAC4 |
| 618 | REUS | RALLY EXPRESS USA | | | SCAC3 |
| 619 | REV | RVL Aviation Ltd | Callsign: Endurance, | GB | AVCODES |
| 620 | REVA | RIVIERA FINANCE | | | SCAC3 |
| 621 | REVA | REVOLUTION LOGISTICS LLC | | | SCAC4 |
| 622 | REVA | REVA S.A. | | RO | VKM |
| 623 | REVC | REVCO INC | | | SCAC3 |
| 624 | REVC | RAPID ELECTRIC VEHICLES INC | | | SCAC4 |
| 625 | REVD | REEVES DRILLERS SUPPLY CO INC | | | SCAC3 |
| 626 | REVE | REVELL OIL FIELD CONSTRUCTION INC | | | SCAC3 |
| 627 | REVE | REVOLUTION EXPRESS INC | | | SCAC4 |
| 628 | REVG | ROBINSON EXCAVATING & TRUCKING | | | SCAC3 |
| 629 | REVI | RELIABLE VAN & STG INC | | | SCAC3 |
| 630 | REVK | REV TRUCKING | | | SCAC3 |
| 631 | REVL | REVILO TRANSIT LTD | | | SCAC4 |
| 632 | REVM | REAGENS VACUUM TRUCK SERVICE INC | | | SCAC3 |
| 633 | REVQ | RELIABLE VAN AND WAREHOUSE CO | | | SCAC3 |
| 634 | REVR | REVERE TRANSPORT INC | | | SCAC3 |
| 635 | REVS | REEVES, J & K & M & B TRUCKING | | | SCAC3 |
| 636 | REVS | REAVIS, BOBBY CO INC | | | SCAC4 |
| 637 | REVT | REEVES TRUCKING | | | SCAC3 |
| 638 | REVU | REVISS SERVICES (UK) LTD | | GB | BIC |
| 639 | REVU | REVISS SERVICES (UK) LTD | | | SCAC4 |
| 640 | REVW | REEVES WAREHOUSE INC | | | SCAC3 |
| 641 | REW | Regional Air Express GmbH | Callsign: Regional Wings, Ceased operations at start of 2010. | D | AVCODES |
| 642 | REW | Regional Air Express | | | ICAO1 |
| 643 | REWA | REED WAREHOUSES, INC, THE | | | SCAC3 |
| 644 | REWC | R E W ASSOCIATES | | | SCAC3 |
| 645 | REWD | READERS WHOLESALE DISTRIBUTORS LTD | | | SCAC4 |
| 646 | REWE | RED WING EXCURSIONS | | | SCAC3 |
| 647 | REWE | REDWOOD EXPRESS INC | | | SCAC4 |
| 648 | REWH | RED & WHITE TRUCKING SERVICE, INC | | | SCAC3 |
| 649 | REWI | RED WING TRUCKING CO | | | SCAC3 |
| 650 | REWU | RENTAL WORLD AG | | NL | BIC |
| 651 | REWU | RENTAL WORLD AG | | | SCAC4 |
| 652 | REX | Ram Air Freight, Inc. | Callsign: Ram Express, | USA | AVCODES |
| 653 | REX | Regional Express Pty Limited | IATA: ZL, IATA Prefix: 899, | AUS | AVCODES |
| 654 | REX | Ram Air Freight | | | ICAO1 |
| 655 | REX | REA Express, Inc. | added 1/1971; eliminated 4/1974 | | NAKINA |
| 656 | REX | REA Express, owned and operated by Railway Express Agency, Inc. | eliminated 1/1971 | | NAKINA |
| 657 | REX | Railway Express Agency, Inc. | 7/1937-4/1938 (not listed); 1/1941-4/1970 | | NAKINA |
| 658 | REX | Railway Express Agency, Inc. | 1/52-4/70 | | NRHS |
| 659 | REX | REA Express, Inc. | eliminated 4/74 | | NRHS |
| 660 | REX | REX EXPRESS, INC. (RAILWAY EXPRESS AGENCY, INC.) | | | PWRC |
| 661 | REX | Rail Express Systems | | GB | TRAFFIC |
| 662 | REXA | REA EXPRESS INC | | | SCAC3 |
| 663 | REXA | Railway Express Agency, Inc. | Real: REX | USA | TRAFFIC |
| 664 | REXC | ROCKET EXPRESS DELIVERY INC | | | SCAC4 |
| 665 | REXD | RED EXPRESS | | | SCAC4 |
| 666 | REXE | R E X CARTAGE COMPANY | | | SCAC3 |
| 667 | REXER | Albert Rexer GmbH & Co. KG | City: Calw | D | TRAFFIC |
| 668 | REXF | ROLL-EX FREIGHTWAYS INC | | | SCAC4 |
| 669 | REXG | REX TRANSPORT | | | SCAC3 |
| 670 | REXI | REX MOVING & STORAGE CO | | | SCAC3 |
| 671 | REXJ | RJ'S EXPEDITING | | | SCAC4 |
| 672 | REXK | ROADTRAN EXPRESS | | | SCAC4 |
| 673 | REXL | ROBERVAL EXPRESS LIMITED | | | SCAC3 |
| 674 | REXL | RAIL EXPRESS LLC | | | SCAC4 |
| 675 | REXM | REX MOTOR TRANS, INC | | | SCAC3 |
| 676 | REXM | ROMAN EXPRESS INC | | | SCAC4 |
| 677 | REXN | REBEL EXPRESS INC | | | SCAC3 |
| 678 | REXN | REBEL EXPRESS INC | | | SCAC4 |
| 679 | REXO | REXCO | | | SCAC3 |
| 680 | REXO | ROUTE 88 TRANSPORTATION INC | | | SCAC4 |
| 681 | REXP | RUDOLF EXPRESS CO | | | SCAC3 |
| 682 | REXP | REDBIRD EXPRESS LLC | | | SCAC4 |
| 683 | REXQ | KING, REX | | | SCAC3 |
| 684 | REXQ | RIO EXPRESS | | | SCAC4 |
| 685 | REXS | R-EXPRESS INC | | | SCAC3 |
| 686 | REXS | RAMA EXPRESS | | | SCAC4 |
| 687 | REXSK | REXIAS, a.s. | | SK | VKM |
| 688 | REXT | REX TRANSPORTATION CO | | | SCAC3 |
| 689 | REXU | REXWAL SERVICES S A | | | SCAC4 |
| 690 | REXV | ROYAL EXPRESS TRANSPORT INC | | | SCAC3 |
| 691 | REXV | RUNWAY EXPRESS | | | SCAC4 |
| 692 | REXW | REX WAREHOUSE & DISTRIBUTING | | | SCAC3 |
| 693 | REXW | REXWAL SERVICES SA | | FR | VKM |
| 694 | REXWL | REXWAL SERVICES SA | | CH | VKM |
| 695 | REXX | IRESIN LLC | | | PWRC |
| 696 | REXX | IRESIN LLC | | | SCAC4 |
| 697 | REXY | REIDS EXPRESS INC | | | SCAC3 |
| 698 | REY | Aero-Rey, S.A. de C.V. | Callsign: Aerorey, | MEX | AVCODES |
| 699 | REY | Aero-Rey | | | ICAO1 |
| 700 | REYA | REYNA TRUCKING | | | SCAC3 |
