| T & G Aviation - International Air Response | |||
| TAAG Angola Airlines | DT | DTA | 118 |
| TAAT-Trans Arabian Air Transport | TO | TRT | |
| TACA International Airlines/Groupo TACA | TA | TAI | 202 |
| TACA/Aviateca | GU | GUG | 240 |
| TACA/Nicaraguense de Aviación | 6Y | NIS | 930 |
| TAESA - Transportes Aereos Ejecutivos | GD | TEJ | 838 |
| Tajikair | 7J | TJK | 502 |
| Tajikistan International Airlines | TJ | TZK | |
| TAL Thuringia Airlines | FC | SBY | 859 |
| Talair | TAL | ||
| TAM Linhas Aereas | JJ | TAM | 957 |
| TAM Mercosur | PZ | LAP | 692 |
| TAME-Linea Aerea del Ecuador | EQ | TAE | 269 |
| Tampa Air Cargo | QT | TPA | 729 |
| Tandem Aero | TQ | TDM | 038 |
| TAP-Air Portugal | TP | TAP | 047 |
| TAR-Transporte Aereo Rioplatenese | HRT | ||
| Tara Airlines | IRR | ||
| TAROM-Romanian Air Transport | RO | ROT | 281 |
| Tashkent Aviation Production Association | PQ | CTP | |
| Tassili Airlines | SF | DTH | 515 |
| TAT European Airlines | IJ | TAT | 936 |
| Tatarstan Airlines | KAZ | ||
| Tatra Air | QS | TTR | |
| Tavrey Aircompany | T6 | TVR | 204 |
| TBM | |||
| TCB - Transportes Charter do Brasil | TCJ | ||
| TCS Aviation/TCS Couriers | |||
| TEA Switzerland | BH | TSW | |
| TechAviaService AirCompany | BTS | ||
| Telford Aviation | TEL | ||
| Teranca | WC | DKR | |
| Tesis Aviation Enterprise | UZ | TIS | 246 |
| Thai Air Cargo | TCG | ||
| Thai Airways | TG | THA | 217 |
| Thaijet Airlines | THJ | ||
| Theron Airways | LU | TRN | |
| Thomas Cook Airlines | MT | TCX | 885 |
| Thomsonfly | BY | TOM | |
| Thunderbird | 4A | TBD | |
| Tiger Airways | TR | TGW | |
| Titan Airways | ZT | AWC | |
| Titan Cargo Airlines | XH | TIT | |
| TMC Airlines | TMM | ||
| TNT Airways | 3V | TAY | 756 |
| Tol Air Services | TI | TOL | |
| Tomsk State Air Enterprise | TSK | ||
| Top Air Havacilik Sanayi Ve Ticaret | B6 | TOP | |
| Topair | TPI | ||
| Toumaï Air Tchad | 9D | THE | |
| Tower Air | FF | TOW | 305 |
| Trade Air | TDR | ||
| TradeWinds Airlines Inc | WI | TDX | |
| TRADO Trans Dominican Airways | TAD | ||
| Trans Air | P6 | MUI | 356 |
| Trans Air Link | TY | GJB | 348 |
| Trans Am | 7T | RTM | 144 |
| Trans Atlantic Airlines of the Gambia | TGL | ||
| Trans Attico | ML | ETC | |
| Trans Continental Airlines | YB | TCC | |
| Trans Continental Airlines | TCN | ||
| Trans European Airways Italia | TD | ||
| Trans Florida Airlines | TFA | ||
| Trans Island Air 2000 | TRD | ||
| Trans Jamaican Airlines | JQ | JQA | 100 |
| Trans Mediterranean Airways | TL | TMA | 270 |
| Trans Service Airlift | TSR | ||
| Trans Travel Airlines | 6N | TRQ | 556 |
| Trans World Airlines | TW | TWA | 015 |
| Trans-Charter Airlines | TCH | ||
| Transaer | T7 | TLA | 839 |
| Transaero Airlines | UN | TSO | 670 |
| Transaero Samara | TSL | ||
| Transafrik International | TFK | ||
| Transamazonica | TAZ | ||
| Transasia Airways | GE | TNA | 170 |
| Transavia Airlines | HV | TRA | 979 |
| Transaviaexport Airline | AL | TXC | 221 |
| Transavio | TVO | ||
| Transbrasil SA Linhas Aereas/Interbrasil Star | TR | TBA | 653 |
| Transcontinental Sur | TCT | ||
| TransEast Airlines | T4 | TRL | 609 |
| TransMeridian Airlines | T9 | TRZ | |
| Transmile Air Services | TH | TSE | 539 |
| Transportes Aereos Bolivianos | BOL | 901 | |
| Transportes Aereos de Cabo Verde (TACV) | VR | TCV | 696 |
| Transportes Aereos de El Salvador | TES | ||
| Transportes Aeromar SA de CV | VW | TAO | 942 |
| Transwede Airways AB | TQ | TWE | 227 |
| Transwest Air | 9T | ABS | 909 |
| Transworld Airfreighters | |||
| Travel Service | QS | TVS | |
| Tri-MG Intra Asia Airlines | GY | TMG | |
| Triangle Airline | TRU | ||
| Tristar Air | TSY | ||
| Tropic Air | PM | TOS | |
| Tropical Airlines | TOA | ||
| Trygg-Flyg | TYG | ||
| TTA-Transporte e Trabalho Aereo | TTA | ||
| Tuifly | HF | HLF | 617 |
| Tulipair | TLP | ||
| Tuninter | UG | TUI | 150 |
| Tunisair | TU | TAR | 199 |
| Tunisavia | TAJ | ||
| TUR European Airways | YI | ||
| Turan Air | 3T | URN | 359 |
| Turkish Airlines | TK | THY | 235 |
| Turkmenistan Airlines | T5 | TUA | 542 |
| Turks Air | QW | TCI | 254 |
| Turtle Airways | KT | TLT | |
| Tyrolean Airways | VO | TYR | 734 |
| Tyumen Airlines | 7M | TYM | 691 |
| Tyumenavia | P2 | TYN | 298 |