| 9301 | RTNF | RITE WAY TRANSFER INC | | | SCAC3 |
| 9302 | RTNG | REED TRUCKING | | | SCAC3 |
| 9303 | RTNJ | RTS TRANSPORTATION LLC | | | SCAC4 |
| 9304 | RTNL | RAM TRANSPORTATION AND LEASING | | | SCAC3 |
| 9305 | RTNM | RTC TRANSPORT LLC | | | SCAC4 |
| 9306 | RTNN | ROYAL TRANSPORT INC | | | SCAC3 |
| 9307 | RTNN | RONTRANS INTERNATIONAL | | | SCAC4 |
| 9308 | RTNO | REITANO TRUCKING | | | SCAC3 |
| 9309 | RTNO | RT TRANSPORT | | | SCAC4 |
| 9310 | RTNP | RATE TRANSPORT CO INC | | | SCAC3 |
| 9311 | RTNQ | R & T TRANSPORTATION INC | | | SCAC4 |
| 9312 | RTNR | ROCK THEN ROLL INC | | | SCAC3 |
| 9313 | RTNS | RELIABLE TRANSFER & STORAGE COMPANY | | | SCAC3 |
| 9314 | RTNT | ROMANS 10:9 TOURS INCORPORATED | | | SCAC3 |
| 9315 | RTNY | ROCHA, TONY N JR | | | SCAC3 |
| 9316 | RTO | Arhabaev Tourism Airlines | Callsign: Artoair, | KZ | AVCODES |
| 9317 | RTO | Rectimo Air Transports SAS | Callsign: Raccoon, | F | AVCODES |
| 9318 | RTO | Arhabaev Tourism Airlines | | | ICAO1 |
| 9319 | RTO | Rio Tinto Group | Mining company | AUS | TRAFFIC |
| 9320 | RTOA | RESOURCE TRANSPORTATION OF AMERICA | | | SCAC3 |
| 9321 | RTOB | RICHS TOURS | | | SCAC3 |
| 9322 | RTOC | RUTH OIL COMPANY | | | SCAC4 |
| 9323 | RTOD | | Real: RTO, City: Dijon | F | TRAFFIC |
| 9324 | RTOG | Regionstog A/S | 2009 - | DK | jernbanen.dk |
| 9325 | RTOG | Regionstog A/S | 2009 | DK | TRAFFIC |
| 9326 | RTOG | Regionstog A/S | | DK | VKM |
| 9327 | RTOH | R B TRANSPORTATION | | | SCAC3 |
| 9328 | RTOI | RAM TRANSPORTATION INC | | | SCAC3 |
| 9329 | RTOI | RMA TRANSPORTATION SERVICES INC | | | SCAC4 |
| 9330 | RTOL | ROYAL TRANSPORT LTD | | | SCAC3 |
| 9331 | RTOL | ROAD TRANSPORTATION SOLUTIONS | | | SCAC4 |
| 9332 | RTON | RACER TRANSPORTATION INC | | | SCAC3 |
| 9333 | RTON | ROUTE ONE TRANSPORT | | | SCAC4 |
| 9334 | RTOO | RAJASON TOOLS INC | | | SCAC4 |
| 9335 | RTOP | RED TOP CABS INC | | | SCAC3 |
| 9336 | RTOQ | RILEYS TRANSPORTATION OF OHIO INC | | | SCAC4 |
| 9337 | RTOS | R TRANSPORT SERVICES LLC | | | SCAC4 |
| 9338 | RTOW | RUBENS TOWING | | | SCAC4 |
| 9339 | RTOZ | (REAZ) RETIRED 04-06-93 ATP (ACI 2490) | | | PWRC |
| 9340 | RTPF | ROUTED THRU-PAC INC | | | SCAC3 |
| 9341 | RTPF | ROUND TOP FARM | | | SCAC4 |
| 9342 | RTPG | ROUND TRIP TRANSPORT LLC | | | SCAC4 |
| 9343 | RTPI | ROUTH TRANSPORTATION | | | SCAC3 |
| 9344 | RTPI | ROUTH TRANSPORTATION | | | SCAC4 |
| 9345 | RTPJ | RST TRANSPORT INC | | | SCAC3 |
| 9346 | RTPK | R & T PRODUCTS INC | | | SCAC4 |
| 9347 | RTPL | REGAL TENT PRODUCTIONS LTD | | | SCAC4 |
| 9348 | RTPM | RANGER TRANSPORT INC | | | SCAC3 |
| 9349 | RTPM | RANGER TRANSPORT INC | | | SCAC4 |
| 9350 | RTPN | ROBERTS TRANSPORTATION | | | SCAC3 |
| 9351 | RTPO | RELIANCE TRANSPORT CO | | | SCAC3 |
| 9352 | RTPP | RAPID TRANSPORT CORPORATION | | | SCAC3 |
| 9353 | RTPR | REAL TRANSPORTATION | | | SCAC3 |
| 9354 | RTPR | RT EXPRESS LLC | | | SCAC4 |
| 9355 | RTPS | REDMOND TRANSPORTATION SYSTEMS | | | SCAC3 |
| 9356 | RTPS | ROUSE TRANSPORT LLC | | | SCAC4 |
| 9357 | RTPT | RIC TRANSPORT S.A | | | SCAC3 |
| 9358 | RTPV | ROCHES TRANSPORTING INC | | | SCAC3 |
| 9359 | RTPX | General Electric Railcar Corp. | added 4/2004; 7/2005 | | NAKINA |
| 9360 | RTPX | Savage-Tolk Energy Services | added 4/2001; eliminated 4/2004 | | NAKINA |
| 9361 | RTPX | Wheelabrator Coal Services Co. | added 4/1982; 1/1994-7/2000; eliminated 4/2001 | | NAKINA |
| 9362 | RTPX | Wheelabrator Coal Services Co. | added 4/82; 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 9363 | RTPX | Savage-Tolk Energy Services | added 4/2001 | | NRHS |
| 9364 | RTPX | *SAVAGE-TOLK ENERGY SERVICES [(WCSX) WHEELABRATOR COAL SERVICES CO.] | | | PWRC |
| 9365 | RTPX | +GENERAL ELECTRIC RAIL SERVICES CORP. | | | PWRC |
| 9366 | RTPX | Wheelabrator Coal Services (GE Rail Services) | | | RSRV |
| 9367 | RTPX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 9368 | RTQ | Air Turquoise SAS | IATA: RT, Ceased operations on 02 August 2006. | F | AVCODES |
| 9369 | RTQ | Air Turquoise | | | ICAO1 |
| 9370 | RTQA | RT2000 CARTAGE | | | SCAC4 |
| 9371 | RTQI | R.T.Q. INC. | | | SCAC4 |
| 9372 | RTQL | RELIABLE TRANSPORT (QUEBEC) INC | | | SCAC3 |
| 9373 | RTQS | ROBART TRUCKING SERVICE INC | | | SCAC3 |
| 9374 | RTR | Sociedade Brasileira de Turismo (ROTASTUR) | IATA: DR, Callsign: Delta Romeo, ICAO callsign changed to Rotatur | BR | AVCODES |
| 9375 | RTR | Air Trust JSC | Callsign: Air Trust, Founded Aug 2012. | KZ | AVCODES |
| 9376 | RTR | Sociedade Brasileira de Turismo (ROTASTUR) | Callsign: Rotatur, ICAO callsign changed from Delta Romeo | BR | AVCODES |
| 9377 | RTR | Rotatur | | | ICAO1 |
| 9378 | RTRA | R AND D TRANSPORTATION | | | SCAC3 |
| 9379 | RTRA | REINHARD TRANSPORTATION LLC | | | SCAC4 |
| 9380 | RTRAN | RailTrans | | A | TRAFFIC |
| 9381 | RTRB | ROSE TRUCK BROKERS INC | | | SCAC3 |
| 9382 | RTRC | RICHMOND TERMINAL RAILWAY CO. | | | PWRC |
| 9383 | RTRC | REED TRUCKING COMPANY INC | | | SCAC3 |
| 9384 | RTRH | R T R TRUCKING INC | | | SCAC3 |
| 9385 | RTRI | ROCOR TRUCK LINES INC | | | SCAC3 |
| 9386 | RTRI | Railway Technical Research Institute | | J | TRAFFIC |
| 9387 | RTRJ | R T R INC | | | SCAC4 |
| 9388 | RTRK | ROBERTSON, T R TRUCKING INC | | | SCAC4 |
| 9389 | RTRL | ROBERTS TRUCK RENTAL & LEASING INC | | | SCAC3 |
| 9390 | RTRM | RAM TRUCKING INC | | | SCAC3 |
| 9391 | RTRN | RICE TRANSPORTATION | | | SCAC3 |
| 9392 | RTRO | RETROSPECT TRANSPORTATION INC | | | SCAC3 |
| 9393 | RTRQ | RAFFAELE, T TRUCKING CORP | | | SCAC3 |
| 9394 | RTRQ | RATE TRANSPORT CO INC | | | SCAC4 |
| 9395 | RTRR | ROADTRAIN TRAILER REPAIR INC | | | SCAC3 |
| 9396 | RTRR | ROADRUNNER TRANSPORTATION | | | SCAC4 |
| 9397 | RTRT | ROSE TRAILER TOTERS | | | SCAC3 |
| 9398 | RTRU | RÉVÉSZ TRANS KFT. | | H | BIC |
| 9399 | RTRU | ROAD TRAILER RENTALS INCORPORATED | | | PWRC |
| 9400 | RTRU | Road Trailer Rentals | | | RSRV |
