| 4601 | THRX | TRANSPORTATION CORPORATION OF AMERICA | | | PWRC |
| 4602 | THRX | TENNESSEE HOLSTON RAILWAY | | | PWRC |
| 4603 | THRX | Transportation of America | | | RSRV |
| 4604 | THRX | TRANSPORTATION CORPORATION OF AMERI | | | SCAC4 |
| 4605 | THRY | TRANSPORT HENRI ROY ENR | | | SCAC4 |
| 4606 | THS | Transportes Aereos Hispanos, S.A. | IATA: VD, Callsign: THS, ICAO callsign changed to Tahis | E | AVCODES |
| 4607 | THS | Transportes Aereos Hispanos, S.A. | IATA: VD, Callsign: Tahis, ICAO callsign changed from THS. Designator VD recalled by IATA | E | AVCODES |
| 4608 | THSB | TENNESSEE LUMBER HAULERS LLC | | | SCAC4 |
| 4609 | THSD | TARA HILLS STUD | | | SCAC4 |
| 4610 | THSE | TECHNICAL SERVICES INC | | | SCAC4 |
| 4611 | THSG | THOUSAND ISLANDS PRINTING CO INC | | | SCAC4 |
| 4612 | THSJ | THREE STAR TRANSPORTATION INC | | | SCAC4 |
| 4613 | THSL | TRANS HARBOR SERVICES LLC | | | SCAC4 |
| 4614 | THSN | THOMPSON, INC | | | SCAC1 |
| 4615 | THSN | THORSON TRUCKING | | | SCAC4 |
| 4616 | THSO | TRANSPORTES SANCHEZ | | | SCAC4 |
| 4617 | THSP | THOMPSON TRANSPORTATION INC | | | SCAC4 |
| 4618 | THSR | TRANSPORT NESKO INC | | | SCAC4 |
| 4619 | THSR | Taiwan High Speed Railway | | RC | TRAFFIC |
| 4620 | THSS | TORRES TRUCKING | | | SCAC4 |
| 4621 | THST | THURSTON OIL COMPANY INC | | | SCAC4 |
| 4622 | THSU | {TRADING HOUSE "SINTEZ-OIL", LTD};ZIPCODE=606030 | | RUS | BIC |
| 4623 | THSU | TEMPOHOUSING | | | SCAC4 |
| 4624 | THSW | THREADED SCREW PRODUCTS CO INC | | | SCAC4 |
| 4625 | THSX | The New York, Susquehanna & Western Technical & Historical Society Inc. | 7/2005 (not listed) | | NAKINA |
| 4626 | THSX | NEW YORK, SUSQUEHANNA & WESTERN TECHNICAL & HISTORICAL SOCIETY INC. | | | PWRC |
| 4627 | THSX | New York, Susquehanna, & Western Technical and Historical Society | | | RSRV |
| 4628 | THSX | NEW YORK SUSQUEHANNA & WESTERN TECH | | | SCAC4 |
| 4629 | THT | Air Tahiti Nui | IATA: TN, Callsign: Tahiti Airlines, IATA Prefix: 244, | PF | AVCODES |
| 4630 | THT | Air Tahiti Nui | IATA: TN | | ICAO1 |
| 4631 | THT | Air Tahiti Nui | | F | TRAFFIC |
| 4632 | THTA | T & H TRANSPORT LLC | | | SCAC4 |
| 4633 | THTB | THEODORA TANKERS AGENCIES | | | SCAC4 |
| 4634 | THTI | THETA INDUSTRIES LTD | | | SCAC4 |
| 4635 | THTK | THUNDER TRUCKING INC | | | SCAC4 |
| 4636 | THTL | T-HAUL TANK LINES LC | | | SCAC4 |
| 4637 | THTM | THORN TRANSPORT LTD | | | SCAC4 |
| 4638 | THTN | THOMAS TRANSPORT DELIVERY INC | | | SCAC4 |
| 4639 | THTQ | THAKUR TRANSPORT INC | | | SCAC4 |
| 4640 | THTV | TAHOE TRUCKEE DELIVERY INC | | | SCAC4 |
| 4641 | THTW | THREE TWO THREE FIVE ONE FOUR NINE | | | SCAC4 |
| 4642 | THTY | THROUGH TRANSPORTATION INC | | | SCAC4 |
| 4643 | THU | Thunder Airlines Ltd. | Callsign: Air Thunder, | CDN | AVCODES |
| 4644 | THU | Thunder Airlines | | | ICAO1 |
| 4645 | THUD | Trans Hudson Express | | USA | TRAFFIC |
| 4646 | THUE | THRULINE | | | SCAC4 |
| 4647 | THUI | TIMKEN HOUSED UNITS INC | | | SCAC4 |
| 4648 | THUK | THOMAS TRUCKING | | | SCAC4 |
| 4649 | THUQ | THUNDER AUDIO INC | | | SCAC4 |
| 4650 | THUR | THURSTON MOTOR LINE INC. | | | PWRC |
| 4651 | THUR | THURSTON TRANSPORT INC | | | SCAC4 |
| 4652 | THURBO | Thurbo AG | Real: THB | CH | TRAFFIC |
| 4653 | THUT | THURMAN, THOMAS | | | SCAC4 |
| 4654 | THVA | THACKER HARVESTING LTD | | | SCAC4 |
| 4655 | THVD | THAUVETTE, | | | SCAC4 |
| 4656 | THVN | THOMPSON HORSE VAN LINES LTD | | | SCAC4 |
| 4657 | THVQ | THREE RIVERS INC | | | SCAC4 |
| 4658 | THVS | THREE D (3D) DELIVERY SERVICE INC | | | SCAC4 |
| 4659 | THW | Technische Hilfswerk | | D | TRAFFIC |
| 4660 | THWD | TUSCARORA HARDWOODS TRUCKING INC | | | SCAC4 |
| 4661 | THWK | TOMAHAWK TRANSPORT INC | | | SCAC4 |
| 4662 | THWN | TECHANDPOWER NORTH AMERICA | | | SCAC4 |
| 4663 | THWW | THREE (3) W TRUCKING INC | | | SCAC4 |
| 4664 | THX | The Harbauer Co. | 7/1923-4/1947 | | NAKINA |
| 4665 | THX | The Harbauer Co. | Apr-38 | | NRHS |
| 4666 | THX | THE HARBAUER CO. | | | PWRC |
| 4667 | THXC | THATCHER TRANSPORTATION INC | | | SCAC4 |
| 4668 | THXF | TRANSPORT M CHALIFOUX & FILS INC | | | SCAC4 |
| 4669 | THXN | THUNDER TRANSPORT INC | | | SCAC4 |
| 4670 | THXO | THR TRANSPORTES | | | SCAC4 |
| 4671 | THXR | THREE STAR TRANSPORT LLC | | | SCAC4 |
| 4672 | THXS | TARHEEL TRANSPORTATION SERVICES INC | | | SCAC4 |
| 4673 | THXT | TOMS HOT SHOT TRANSPORT | | | SCAC4 |
| 4674 | THY | Turkish Airlines, Inc. | IATA: TK, Callsign: Turkish, IATA Prefix: 235, Name changed from Turk Hava Yollari (Turkish Airlines). ICAO callsign changed from Turkair | TR | AVCODES |
| 4675 | THY | Turk Hava Yollari (Turkish Airlines) | IATA: TK, Callsign: Turkair, IATA Prefix: 235, Name changed to Turkish Airlines, Inc. ICAO callsign changed to Turkish | TR | AVCODES |
| 4676 | THY | Turkish Airlines | IATA: TK | | ICAO1 |
| 4677 | THY | Turkish Airlines | | TR | TRAFFIC |
| 4678 | THYC | THREE C (3C) LOGISTICS LLC | | | SCAC4 |
| 4679 | THYE | THAYER, ED INC | | | SCAC4 |
| 4680 | THYI | TRANSPORT HAUTE-YAMASKA (GRANBY) IN | | | SCAC4 |
| 4681 | THYL | TRANSFER H Y L | | | SCAC4 |
| 4682 | THYQ | THAYER LOGISTICS INC | | | SCAC4 |
| 4683 | THYS | THYSSEN HANIEL LOGISTIC GMBH | | | SCAC4 |
| 4684 | THYS | Thyssen-Krupp AG | | D | TRAFFIC |
| 4685 | THYT | THREE-WAY TRUCKING INC | | | SCAC4 |
| 4686 | THYU | THIJSSEN DRILLING COMPANY BV | | | SCAC4 |
| 4687 | THZ | Trans Helicoptere Service | Callsign: Lyon Helijet, | F | AVCODES |
| 4688 | THZ | Trans Helicoptere Service | | | ICAO1 |
| 4689 | THZF | TWO THREE ZERO FOUR ONE FOUR SEVEN | | | SCAC4 |
| 4690 | THZW | THRASHER SHIPPING LLC | | | SCAC4 |
| 4691 | TI | Tol Air Services, Inc. | ICAO: TOL, Callsign: Tol Air, | PRI | AVCODES |
| 4692 | TI | Aerial Tours PTY Ltd. | | AUS | AVCODES |
| 4693 | TI | TACA Costa Rica Anonima | ICAO: TAT, Callsign: TACA-Costarica, Name changed from Transportes Aereos del Continente Americano - TACA Costa Rica | CR | AVCODES |
| 4694 | TI | Tailwind Hava Yollari A.S. | ICAO: TWI, Callsign: Tailwind, IATA Prefix: 768, Founded in 2006. | TR | AVCODES |
| 4695 | TI | TAISA Transportes Aereos Internacionales S.A. | Callsign: Tango India, ICAO callsign changed to Taisa | PE | AVCODES |
| 4696 | TI | TAISA Transportes Aereos Internacionales S.A. | ICAO: TII, Callsign: Taisa, ICAO callsign changed from Tango India | PE | AVCODES |
| 4697 | TI | Tropic Ocean Airways, LLC. | | USA | AVCODES |
| 4698 | TI | Turners Island, LLC | 7/2005 | | NAKINA |
| 4699 | TI | *TONAWANDA IRON | | | PWRC |
| 4700 | TI | +TURNERS ISLAND, LLC | | | PWRC |
