| 8501 | TRK | Turkish Airlines General Aviation | Callsign: Turkish Republic, | TR | AVCODES |
| 8502 | TRK | | | TM | TRAFFIC |
| 8503 | TRK | Turkmenistan Railways | | TM | VKM |
| 8504 | TRKA | TRUCKING SPECIALISTS INC | | | SCAC4 |
| 8505 | TRKC | T R & R TRUCKING CORPORATION | | | SCAC4 |
| 8506 | TRKD | TWO RIVERS FS INC | | | SCAC4 |
| 8507 | TRKI | TRUCK POOL SYSTEMS INC | | | SCAC4 |
| 8508 | TRKK | Przedsiębiorstwo Budownictwa Specjalistycznego TRANSKOL Sp. z o.o. | | PL | VKM |
| 8509 | TRKL | TRI-TRUCKING LLC | | | SCAC4 |
| 8510 | TRKOW | Towarzystwo Rodzina Kolejarska | | PL | VKM |
| 8511 | TRKP | TRACK EXPRESS SERVICES | | | SCAC4 |
| 8512 | TRKR | TRUKLINE | | | SCAC4 |
| 8513 | TRKU | TURKON CONTAINER TRANSPORTATION&SHIPPING | | TR | BIC |
| 8514 | TRKU | TURKON LINE | | | SCAC1 |
| 8515 | TRKU | TURKON CONTAINER TRANSPORTATION & S | | | SCAC4 |
| 8516 | TRL | Transeast Airlines Ltd. | IATA: T4, Callsign: Lattrans, | LV | AVCODES |
| 8517 | TRL | Starlite Aviation Pty Ltd | Callsign: Starstream, | ZA | AVCODES |
| 8518 | TRL | Starlite Aviation | | | ICAO1 |
| 8519 | TRL | | ~Sorin Oprisan | GB | TRAFFIC |
| 8520 | TRLD | TRAILER BRIDGE INC (OCEAN) | | | SCAC1 |
| 8521 | TRLD | TRAILER BRIDGE INC | | | SCAC4 |
| 8522 | TRLF | TRANS LINK FORWARDING | | | SCAC4 |
| 8523 | TRLG | Tpикс Лоджистик ЕООД | | BG | VKM |
| 8524 | TRLH | TRAILINER CORP | | | SCAC4 |
| 8525 | TRLI | TIAN RONG LOGISTICS INC | | | SCAC4 |
| 8526 | TRLK | TERROLS TRUCKING LTD | | | SCAC4 |
| 8527 | TRLL | TRLC LLC | | | SCAC4 |
| 8528 | TRLL | | Real: TRL, City: Lorient | F | TRAFFIC |
| 8529 | TRLM | TRANSPORTES LYRMA DE CD JUAREZ SA D | | | SCAC4 |
| 8530 | TRLN | TRANSPORTES R L G SA DE CV | | | SCAC4 |
| 8531 | TRLO | TRICO LIFT | | | SCAC4 |
| 8532 | TRLP | TRANSPORTES LOPEZ | | | SCAC4 |
| 8533 | TRLQ | TIRADO, LUIS TRUCKING | | | SCAC4 |
| 8534 | TRLS | TRANSAM LOGISTICS INC | | | SCAC4 |
| 8535 | TRLU | TRITON CONTAINER INTERNATIONAL LTD | | BM | BIC |
| 8536 | TRLU | TRANSAMERICA LEASING, INC. | | | PWRC |
| 8537 | TRLU | TAL International | | | RSRV |
| 8538 | TRLU | TRANSAMERICA LEASING INC | | | SCAC4 |
| 8539 | TRLW | TRANSPORT ROGER LEGER INC | | | SCAC4 |
| 8540 | TRLX | Terrell Oil & Refining Co. | 7/1923 | | NAKINA |
| 8541 | TRLX | Texas Railcar Leasing Co. | added 7/1989; 1/1994-7/2000; eliminated 10/2001; 7/2005 (not listed) | | NAKINA |
| 8542 | TRLX | Texas Railcar Leasing Co. | added 7/89; 1/94-7/2000 | | NRHS |
| 8543 | TRLX | *TERRELL OIL & REFINING CO. | | | PWRC |
| 8544 | TRLX | +TEXAS RAILCAR LEASING COMPANY | | | PWRC |
| 8545 | TRLX | Texas Railcar Leasing | | | RSRV |
| 8546 | TRLX | VTG RAIL INC | | | SCAC4 |
| 8547 | TRLX | Texas Railcar Leasing Co. | | USA | TRAFFIC |
| 8548 | TRLY | TRAILER CONVOYS INC | | | SCAC4 |
| 8549 | TRM | Transport Aerien de Mauritanie (TAM) | Callsign: Sotrans, | RIM | AVCODES |
| 8550 | TRM | TAM Transports Aériens Méditerranéens | Callsign: Airtam, | F | AVCODES |
| 8551 | TRM | Transport Aerien de Mauritanie | | | ICAO1 |
| 8552 | TRMA | TRANSMARITIMA S A | | | SCAC4 |
| 8553 | TRMB | TROUTMAN TRANSPORTATION LLC | | | SCAC4 |
| 8554 | TRMD | TRANSPORTES REFRIGERADOS MAGNOLIA | | | SCAC4 |
| 8555 | TRME | TRANSPORT MOTOR EXPRESS CO | | | PWRC |
| 8556 | TRME | TRIMSA | | | SCAC4 |
| 8557 | TRMK | T R L TRUCKING | | | SCAC4 |
| 8558 | TRML | TRAMIL S A DE C V | | | SCAC4 |
| 8559 | TRMN | TRUMAN TRANSFER & STORAGE INC | | | SCAC4 |
| 8560 | TRMP | TARGET RESOURCES OF NORTHEASTERN PA | | | SCAC4 |
| 8561 | TRMQ | TERMINAL TRANSPORTATION SERVICES DI | | | SCAC4 |
| 8562 | TRMS | TRANSPORTES MUSA | | | SCAC4 |
| 8563 | TRMT | TRANSPORT ROMATT INC | | | SCAC4 |
| 8564 | TRMU | TARIMSAL KIMYA A.S. | | TR | BIC |
| 8565 | TRMU | TRANSMARINE HAMBURG GMBH | | | SCAC4 |
| 8566 | TRMV | TRANSPORTES RAMCE SA DE CV | | | SCAC4 |
| 8567 | TRMW | City of Tacoma, d/b/a Tacoma Rail Mountain Division | 7/2000-7/2005 | | NAKINA |
| 8568 | TRMW | City of Tacoma, d/b/a Tacoma Rail Mountain Division | Jul-00 | | NRHS |
| 8569 | TRMW | CITY OF TACOMA d/b/a TACOMA RAIL MOUNTAIN DIVISION | | | PWRC |
| 8570 | TRMW | Tacoma Rail Mountain Division | | | RSRV |
| 8571 | TRMW | TACOMA RAIL MOUNTAIN DIVISION | | | SCAC4 |
| 8572 | TRMX | The Railroad Museum—TRM Industries | 1/1975; added 4/1975; 1/1980; eliminated 1/1992; added 4/1992; 1/1994-7/2000; eliminated 1/2001; added 4/2001; 7/2005; eliminated 7/2007 | | NAKINA |
| 8573 | TRMX | The Railroad Museum--TRM Industries | 1/75; added 4/75; 1/80; eliminated 1/92; added 4/92; 1/94-7/2000; eliminated 1/2001; added 4/2001 | | NRHS |
| 8574 | TRMX | *TACOMA RAIL MOUNTAIN DIVISION | | | PWRC |
| 8575 | TRMX | +THE RAILROAD MUSEUM - TRM INDUSTRIES | | | PWRC |
| 8576 | TRMX | TRM Industries | | | RSRV |
| 8577 | TRMX | THE RAILROAD MUSEUM-TRM INDUSTRIES | | | SCAC4 |
| 8578 | TRN | Theron Airways | | ZA | AVCODES |
| 8579 | TRN | Servicios Aereos Corporativos, S.A. de C.V. | Callsign: Aerotron, | MEX | AVCODES |
| 8580 | TRN | Servicios Aereos Corporativos | | | ICAO1 |
| 8581 | TRN | TURNER BUS LINES (DIV OF JACK TURNE | | | SCAC4 |
| 8582 | TRN | Transports Régionaux Neuchâtelois | | CH | TRAFFIC |
| 8583 | TRN | TRN SA (Transports régionaux neuchâtelois) | | CH | VKM |
| 8584 | TRNA | TRANS-AERO-MAR INC | | | SCAC4 |
| 8585 | TRNC | TRANSPORTES CAMPOS GRACIA SA DE CV | | | SCAC4 |
| 8586 | TRNG | TRANSPORTATION RESOURCES GROUP INC | | | SCAC4 |
| 8587 | TRNH | TRINITY SHIPPING LINES | | | SCAC1 |
| 8588 | TRNH | TRINITY SHIPPING LINE S A | | | SCAC4 |
| 8589 | TRNI | TRANS INTERNATIONAL AIRLINES INC | | | SCAC4 |
| 8590 | TRNJ | TRANSINTERNATIONAL SYSTEM INC | | | SCAC4 |
| 8591 | TRNM | TRANSMODE EXPRESS INC | | | SCAC4 |
| 8592 | TRNO | TRANSPORT DECOURT INC | | | SCAC4 |
| 8593 | TRNQ | TRANSPRO | | | SCAC4 |
| 8594 | TRNR | TRANS SERVICES INC | | | SCAC4 |
| 8595 | TRNS | TRANSITAINER | | | SCAC1 |
| 8596 | TRNS | TRANSPORT SPECIALISTS OF MISSISSIPP | | | SCAC4 |
| 8597 | TRNU | TRANSNET SA | | GR | BIC |
| 8598 | TRNU | TRANSNET LTD | | | SCAC4 |
| 8599 | TRNV | TRAMMO NAVIGATION LTD | | | SCAC4 |
| 8600 | TRNW | TRANSWASTE INC | | | SCAC4 |
