| 8601 | TRNX | Trinity Railcar Leasing Corp. | added 7/1979; 1/1980; eliminated 10/1991 | | NAKINA |
| 8602 | TRNX | General Electric Railcar Services Corp. | added 10/1991; 1/1994; eliminated 1/2000 | | NAKINA |
| 8603 | TRNX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 8604 | TRNX | Trinity Railcar Leasing Corp. | added 7/79; 1/80; eliminated 10/91 | | NRHS |
| 8605 | TRNX | General Electric Railcar Services Corp. | added 10/91; 1/94; eliminated 1/2000 | | NRHS |
| 8606 | TRNX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 8607 | TRNX | (NATX) GENERAL ELECTRIC RAILCAR SERVICES CORP. [TRINITY RAILCAR LEASING] | | | PWRC |
| 8608 | TRNX | Trinity Railcar Leasing Corporation | | | RSRV |
| 8609 | TRNX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 8610 | TRNY | TURNSTILE SECURITY SYSTEMS INC | | | SCAC4 |
| 8611 | TRNZ | Tranz Rail | | NZ | TRAFFIC |
| 8612 | TRO | Tropic Airlines-Air Molokai | Callsign: Molokai, | USA | AVCODES |
| 8613 | TRO | Tropic Airlines-Air Molokai | | | ICAO1 |
| 8614 | TROB | TROY FREIGHT EXPEDITING LLC | | | SCAC4 |
| 8615 | TROC | TROPICAL SELECTIONS INC | | | SCAC4 |
| 8616 | TROCK | Transport of Rockland | Real: TOR | USA | TRAFFIC |
| 8617 | TROG | TRANS-UNITED BROKERAGE INC | | | SCAC4 |
| 8618 | TROH | TRANSPORTES 100 SILVA | | | SCAC4 |
| 8619 | TROI | T R S 2000 | | | SCAC4 |
| 8620 | TROK | T ROY TRUCKING INC | | | SCAC4 |
| 8621 | TROL | TRANSPORT ROGER OUELLET | | | SCAC4 |
| 8622 | TROL | TRANSPOL Sp. z o.o. | | PL | VKM |
| 8623 | TRON | TR TRANSPORTATION INC | | | SCAC4 |
| 8624 | TRON | | | N | TRAFFIC |
| 8625 | TROP | TRIO TRANSPORT SYSTEMS INC | | | SCAC4 |
| 8626 | TROQ | TRANSPORTES ROQUIT | | | SCAC4 |
| 8627 | TROT | TRANSPORT ROLLEX LTEE | | | SCAC4 |
| 8628 | TROU | FELIX TROLL TRANSPORT GMBH | | A | BIC |
| 8629 | TROU | TRANS OCEAN LTD. | | | PWRC |
| 8630 | TROU | Trans Ocean Limited | | | RSRV |
| 8631 | TROU | TRITON OVERSEES | | | SCAC1 |
| 8632 | TROU | TRACO HANDELS-UND BERATUNGS GMBH | | | SCAC4 |
| 8633 | TROV | TRANSPORT ROVIMAX ENR | | | SCAC4 |
| 8634 | TROX | Transcontinental Oil Co. | 8/1920-7/1930 | | NAKINA |
| 8635 | TROX | Trojan Recycling Inc. | added 4/2003; 7/2005 | | NAKINA |
| 8636 | TROX | *TRANSCONTINENTAL OIL CO. | | | PWRC |
| 8637 | TROX | +TROJAN RECYCLING INC. | | | PWRC |
| 8638 | TROX | Transcontinental Oil Co. | | USA | TRAFFIC |
| 8639 | TROY | TROY HUMPHREY MOVING AND STORAGE INC. | | | SCAC1 |
| 8640 | TROY | TROY HUMPHREY MOVING & STORAGE INC | | | SCAC4 |
| 8641 | TRP | Maryland State Police | Callsign: Trooper, | USA | AVCODES |
| 8642 | TRP | Maryland State Police | | | ICAO1 |
| 8643 | TRPC | TRANSPORTES CONTRERAS | | | SCAC4 |
| 8644 | TRPE | TRANSPORTES AZTECA INTERNATIONAL IN | | | SCAC4 |
| 8645 | TRPG | TRIPLE G CARRIERS | | | SCAC4 |
| 8646 | TRPI | TRANSPORTES DE LOS RIOS RUBIO | | | SCAC4 |
| 8647 | TRPJ | TRIPLE J TRANSPORT INC | | | SCAC4 |
| 8648 | TRPK | TRAPKO ENTERPRISES INC | | | SCAC4 |
| 8649 | TRPL | TRIPLE R PRODUCE INC | | | SCAC4 |
| 8650 | TRPN | TRIMPE, BOB TRUCKING, LLC | | | SCAC4 |
| 8651 | TRPQ | TRANSPORT P G R INC | | | SCAC4 |
| 8652 | TRPS | TRANSPORT SERVICES INTERNATIONAL | | | SCAC4 |
| 8653 | TRPT | TRIPLE TRANSPORT INC | | | SCAC4 |
| 8654 | TRPU | TROPICAL TRAILER LEASING LLC | | USA | BIC |
| 8655 | TRPU | Tropical Trailer Leasing | | | RSRV |
| 8656 | TRPU | PACIFIC INTERNATIONA LINES (PTE) LT | | | SCAC4 |
| 8657 | TRPV | TRANSPORTATION PROVIDER SERVICES IN | | | SCAC4 |
| 8658 | TRPW | TRANS PLUS | | | SCAC4 |
| 8659 | TRPX | Tropigas Inc. of Florida | added 1/1966; 10/1966-1/1980; eliminated 1/1989 | | NAKINA |
| 8660 | TRPX | Petrolane Gas Service Ltd. Partnership | 1/1994; eliminated 10/1995 | | NAKINA |
| 8661 | TRPX | AmeriGas Propane, L.P. | added 10/1995; eliminated 4/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 8662 | TRPX | Tropigas Inc. of Florida | added 1/66; 10/66-1/80; eliminated 1/89 | | NRHS |
| 8663 | TRPX | Petrolane Gas Service Ltd. Partnership | 1/94; eliminated 10/95 | | NRHS |
| 8664 | TRPX | AmeriGas Propane, L.P. | added 10/95; eliminated 4/98; 7/2000 | | NRHS |
| 8665 | TRPX | *TROLLEY PLAZA | | | PWRC |
| 8666 | TRPX | +AMERIGAS PROPANE L.P. [(PGRX) PETROLANE GAS SERVICE LTD.; TROPIGAS INC. OF FLORIDA] | | | PWRC |
| 8667 | TRPX | Tropigas of Florida | | | RSRV |
| 8668 | TRPX | PETROLANE GAS SERVICE LIMITED PARTN | | | SCAC4 |
| 8669 | TRQ | Trans Travel Airlines (TTA) | IATA: 6N, Callsign: Hunter, Ceased operations on 07 January 2003. Desginator 6N* reinstated by IATA. Formerly known as Turdus Airways B.V. | NL | AVCODES |
| 8670 | TRQ | Tarco Air | IATA: 3T, Callsign: Airtarco, Established in 2009. Name changed to Tarco Aviation. ICAO designator changed to TQQ. ICAO callsign changed to Aviation Tarco. | SUD | AVCODES |
| 8671 | TRQ | Turdus Airways | | | ICAO1 |
| 8672 | TRQA | TRANSPORTES R ORTEGA | | | SCAC4 |
| 8673 | TRQB | TRANSPORTES HERMANOS RODRIGUEZ SA D | | | SCAC4 |
| 8674 | TRQD | TRAIL RIDER EQUIPMENT INC | | | SCAC4 |
| 8675 | TRQI | TRI TRANSPORT | | | SCAC4 |
| 8676 | TRQK | T&R TRUCKING | | | SCAC1 |
| 8677 | TRQL | TALLER AVILA | | | SCAC4 |
| 8678 | TRQM | TRANSPORT R ET R MARQUIS INC | | | SCAC4 |
| 8679 | TRQO | TRIDENT LINE CORPORATION | | | SCAC4 |
| 8680 | TRQQ | TRUMORE TRANSPORT | | | SCAC4 |
| 8681 | TRQR | TRANSPORTES QUIROZ | | | SCAC4 |
| 8682 | TRQS | TRI-STATE TRANSPORT INC | | | SCAC4 |
| 8683 | TRQT | TORQUE A MATIC ENGINE & | | | SCAC4 |
| 8684 | TRQV | TRANSMAQUILA S A DE C V | | | SCAC4 |
| 8685 | TRR | Tramson Limited | Callsign: Tramson, | SUD | AVCODES |
| 8686 | TRR | North Aamerican Airlines | Callsign: Terra, | CDN | AVCODES |
| 8687 | TRR | Tramson Limited | | | ICAO1 |
| 8688 | TRR | Traditionsbahn Radebeul-Radeburg eV | Radebeul | D | privat-bahn.de |
| 8689 | TRR | THUNDER RAIL, LTD. | | | PWRC |
| 8690 | TRR | THUNDER RAIL LTD | | | SCAC4 |
| 8691 | TRRA | Terminal R.R. Association of St. Louis | 8/1920-7/2005 | | NAKINA |
| 8692 | TRRA | Terminal R.R. Association of St. Louis | 4/38-7/2000 | | NRHS |
| 8693 | TRRA | TERMINAL RAILROAD ASSOCIATION OF ST. LOUIS | | | PWRC |
| 8694 | TRRA | Terminal Railroad Association of St Louis | | | RSRV |
| 8695 | TRRA | Terminal Railroad Association of St. Louis | | USA | TRAFFIC |
| 8696 | TRRB | TRANSPORT ROBERT (1973) LTEE | | | SCAC1 |
| 8697 | TRRB | TRANSPORT ROBERT (1973) LTEE | | | SCAC4 |
| 8698 | TRRC | THREE R (3R) AUTOMOTIVE | | | SCAC4 |
| 8699 | TRRE | TRANSPORTES RAMIRO | | | SCAC4 |
| 8700 | TRRG | TRANSPORT R GINGRAS INC | | | SCAC4 |
