| 2501 | RDWR | ROADWARE GROUP INC | | | SCAC4 |
| 2502 | RDWS | ROADWAY EXPRESS INC (SPECIAL COMMOD | | | SCAC3 |
| 2503 | RDWT | RED & WHITE INC | | | SCAC3 |
| 2504 | RDWT | R & D WELDING & | | | SCAC4 |
| 2505 | RDWY | ROADWAY EXPRESS, INC. | | | PWRC |
| 2506 | RDWY | Roadway Express | | | SCAC2 |
| 2507 | RDWY | ROADWAY EXPRESS, INC | | | SCAC3 |
| 2508 | RDWY | ROADWAY EXPRESS INC (NOW KNOWN AS Y | | | SCAC4 |
| 2509 | RDWZ | ROADWAY EXPRESS, INC. | | | PWRC |
| 2510 | RDWZ | Roadway Express | | | RSRV |
| 2511 | RDWZ | ROADWAY EXPRESS, INC. | | | SCAC4 |
| 2512 | RDX | Airflite, Inc. | Callsign: Red Sun, | USA | AVCODES |
| 2513 | RDX | Raildox GmbH & Co. KG | | D | TRAFFIC |
| 2514 | RDX | Raildox GmbH & Co, KG | | DE | VKM |
| 2515 | RDXA | ROADEX AMERICA INC | | | SCAC4 |
| 2516 | RDXB | RIDSDALE TRANSPORT LTD | | | SCAC4 |
| 2517 | RDXC | ROADEX INC | | | SCAC3 |
| 2518 | RDXC | ROADEX INC | | | SCAC4 |
| 2519 | RDXD | RDX INC | | | SCAC4 |
| 2520 | RDXE | REEDEX INCORPORATED | | | SCAC4 |
| 2521 | RDXF | RD EXPEDITED INC | | | SCAC4 |
| 2522 | RDXG | RDR TRANSPORTATION LLC | | | SCAC4 |
| 2523 | RDXH | RUSH DELIVERY XPRESS INC | | | SCAC4 |
| 2524 | RDXI | ROADEX INC | | | SCAC3 |
| 2525 | RDXI | ROAD EX LOGISTICS INC | | | SCAC4 |
| 2526 | RDXO | RAIDER EXPRESS INC | | | SCAC4 |
| 2527 | RDXP | R & D EXPRESS INC | | | SCAC3 |
| 2528 | RDXQ | ROADWAY EXPRESS QUEBEC LTD | | | SCAC3 |
| 2529 | RDXR | REDS EXPRESS | | | SCAC4 |
| 2530 | RDXS | REDEX INC | | | SCAC3 |
| 2531 | RDXS | RDX FREIGHT SYSTEMS INC | | | SCAC4 |
| 2532 | RDXT | ROADEX TRANSPORT LTD | | | SCAC3 |
| 2533 | RDXU | RADIX CO., LTD. | | ROK | BIC |
| 2534 | RDXW | READY EXPRESS INC | | | SCAC3 |
| 2535 | RDXW | R & D TRANSPORTATION INC | | | SCAC4 |
| 2536 | RDXY | ROADEX CY INC | | | SCAC4 |
| 2537 | RDY | Phantom Services, LLC | Callsign: Rodney, | USA | AVCODES |
| 2538 | RDYA | ROMO DE SAMPAYO, VIOLETA | | | SCAC4 |
| 2539 | RDYB | RUDY, RICHARD B INC | | | SCAC4 |
| 2540 | RDYC | ROWLAND DRAYAGE CORPORATION | | | SCAC3 |
| 2541 | RDYD | RAPID DELIVERY SERVICE CO INC | | | SCAC4 |
| 2542 | RDYE | REDEYE EXPRESS LLC | | | SCAC4 |
| 2543 | RDYF | RUDYS FARM COMPANY | | | SCAC3 |
| 2544 | RDYG | RUDY TRUCKING | | | SCAC4 |
| 2545 | RDYI | ROLLAND DEY CONTAINER LINE | | | SCAC4 |
| 2546 | RDYJ | READY, J EXPRESS | | | SCAC3 |
| 2547 | RDYK | READY TRUCKING LLC | | | SCAC4 |
| 2548 | RDYL | ROADWORTHY LEASING INC | | | SCAC3 |
| 2549 | RDYL | READYLTL.COM INC | | | SCAC4 |
| 2550 | RDYN | ROBERTS & DYBDAHL INC | | | SCAC4 |
| 2551 | RDYO | READY TO ROLL TRANSPORTATION INC | | | SCAC4 |
| 2552 | RDYQ | READY CO, THE | | | SCAC3 |
| 2553 | RDYR | REEDY, ROBERT E & SONS CO | | | SCAC4 |
| 2554 | RDYS | RANDYS WRECKER SERVICE | | | SCAC3 |
| 2555 | RDYS | ROUSHS DELIVERY SERVICE INC | | | SCAC4 |
| 2556 | RDYT | READY TRUCKING INC | | | SCAC3 |
| 2557 | RDYV | RUSHMORE DELIVERY SERVICE | | | SCAC3 |
| 2558 | RDZ | Rodze Air Limited | Callsign: Rodze Air, | WAN | AVCODES |
| 2559 | RDZ | Rodze Air | | | ICAO1 |
| 2560 | RDZA | RODRIGUEZ, AUGUSTINE | | | SCAC3 |
| 2561 | RDZA | RODRIGUEZ TRUCKING | | | SCAC4 |
| 2562 | RDZH | RODRIGUEZ, HECTOR LUIS | | | SCAC4 |
| 2563 | RDZK | RUDZEK INC | | | SCAC3 |
| 2564 | RDZK | RODRIGUEZ TRUCKING | | | SCAC4 |
| 2565 | RDZO | RODZ TRANSPORT | | | SCAC4 |
| 2566 | RDZP | RODRIGUEZ PRODUCE & FREIGHT COMPANY | | | SCAC4 |
| 2567 | RDZT | RODRIGUEZ TRANSFER | | | SCAC4 |
| 2568 | RE | Aer Arann Express (Comharbairt Gaillimh Teo) | ICAO: REA, Callsign: Aer Arann, IATA Prefix: 809, Name changed to Stobart Air. ICAO designator changed to STK. Operates as Aer Arann Express. Designator RE reinstated by IATA | IRL | AVCODES |
| 2569 | RE | Americana de Aviacion, C.A. | Callsign: Amevia, | EC | AVCODES |
| 2570 | RE | Stobart Air (Comhforbairt Gaillimh) | ICAO: STK, Callsign: Stobart, Ceased operations on 12 June 2021. Name changed from Cornharbairl Gaillimh Teo d/b/a Aer Arann. ICAO designator changed from REA w.e.f. 04 August 2014. Operates as Aer Arann Express. Designator RE reinstated by IATA | IRL | AVCODES |
| 2571 | RE | Airhub Airlines Limited | ICAO: GJM, Callsign: Airhub, IATA Prefix: 521, IATA Designator changed from AH*. | M | AVCODES |
| 2572 | RE | Rheinische Eisenbahn GmbH | Linz | D | privat-bahn.de |
| 2573 | RE | Relco | | | RSRV |
| 2574 | RE | Rheinische Eisenbahn GmbH | | DE | VKM |
| 2575 | REA | Aer Arann Express (Comharbairt Gaillimh Teo) | IATA: RE, Callsign: Aer Arann, IATA Prefix: 809, Name changed to Stobart Air. ICAO designator changed to STK. Operates as Aer Arann Express. Designator RE reinstated by IATA | IRL | AVCODES |
| 2576 | REA | Aer Arann Teoranta | IATA: EH, Callsign: Aer Arann, Name changed to Aer Arann Express (Comharbairt Gaillimh Teo) | IRL | AVCODES |
| 2577 | REA | Red Air S.r.l. | IATA: L5, Callsign: Red Dominicana, IATA Prefix: 377, | DOM | AVCODES |
| 2578 | REA | Aer Arann | IATA: RE | | ICAO1 |
| 2579 | REA | RAILWAY EXPRESS AGENCY, INC. | | | PWRC |
| 2580 | REA | Reading RailRoad | | USA | TRAFFIC |
| 2581 | REAA | RELOCATE AMERICA (DIV OF AUTO TRANS | | | SCAC3 |
| 2582 | REAB | REDERI A/B SEA LINK | | | SCAC3 |
| 2583 | REAB | RELIABELT, ELIAS | | | SCAC4 |
| 2584 | REAC | REA TRAILERS INC | | | SCAC3 |
| 2585 | REAC | REAGENT CHEMICAL & RESEARCH INC | | | SCAC4 |
| 2586 | READ | REEDEREI FRANK DAHL EK | | | SCAC4 |
| 2587 | REAG | RELIABLE EXPRESS LLC | | | SCAC4 |
| 2588 | REAG | Red Eagle | | GB | TRAFFIC |
| 2589 | REAH | ROFRA ENTERPRISES INC | | | SCAC4 |
| 2590 | REAI | REESE ASSOCIATES INC | | | SCAC3 |
| 2591 | REAJ | REA EXPRESS INC | | | SCAC3 |
| 2592 | REAK | RE-ACT TRANSPORTATION INC | | | SCAC3 |
| 2593 | REAL | (REAZ) TRANSAMERICA LEASING, INC. | | | PWRC |
| 2594 | REALT | Real Transit Inc. | | US-NJ | TRAFFIC |
| 2595 | REAM | R E D TECHNOLOGIES LLC | | | SCAC4 |
| 2596 | REAN | REAMS TRANSFER & STORAGE COMPANY | | | SCAC3 |
| 2597 | REAN | REINDERS, LINDA | | | SCAC4 |
| 2598 | REAO | REA REFRIGERATED TRUCKING INC | | | SCAC3 |
| 2599 | REAP | REALE, P, TRUCKING | | | SCAC3 |
| 2600 | REAQ | REPUBLIC AIRMODAL INC | | | SCAC3 |
