| TAA | Aeropacifico | ||
| TAD | TRADO Trans Dominican Airways | ||
| TAE | EQ | 269 | TAME-Linea Aerea del Ecuador |
| TAH | QE | 067 | Air Moorea |
| TAI | TA | 202 | TACA International Airlines/Groupo TACA |
| TAJ | Tunisavia | ||
| TAL | Talair | ||
| TAM | JJ | 957 | TAM Linhas Aereas |
| TAO | VW | 942 | Transportes Aeromar SA de CV |
| TAP | TP | 047 | TAP-Air Portugal |
| TAR | TU | 199 | Tunisair |
| TAS | Lotus Air | ||
| TAT | IJ | 936 | TAT European Airlines |
| TAW | Skyair Cargo | ||
| TAY | 3V | 756 | TNT Airways |
| TAZ | Transamazonica | ||
| TBA | TR | 653 | Transbrasil SA Linhas Aereas/Interbrasil Star |
| TBD | 4A | Thunderbird | |
| TCC | YB | Trans Continental Airlines | |
| TCG | Thai Air Cargo | ||
| TCH | Trans-Charter Airlines | ||
| TCI | QW | 254 | Turks Air |
| TCJ | TCB - Transportes Charter do Brasil | ||
| TCN | Trans Continental Airlines | ||
| TCO | 826 | AeroTrans Colombiana De Carga | |
| TCT | Transcontinental Sur | ||
| TCV | VR | 696 | Transportes Aereos de Cabo Verde (TACV) |
| TCX | MT | 885 | Thomas Cook Airlines |
| TDM | TQ | 038 | Tandem Aero |
| TDR | Trade Air | ||
| TDX | WI | TradeWinds Airlines Inc | |
| TEJ | GD | 838 | TAESA - Transportes Aereos Ejecutivos |
| TEL | Telford Aviation | ||
| TES | Transportes Aereos de El Salvador | ||
| TEY | Antey | ||
| TFA | Trans Florida Airlines | ||
| TFK | Transafrik International | ||
| TFL | OR | 266 | Arkefly |
| TFS | Fast Airways | ||
| TGA | YT | 030 | Air Togo |
| TGL | Trans Atlantic Airlines of the Gambia | ||
| TGW | TR | Tiger Airways | |
| TGZ | A9 | 606 | Georgian Airlines |
| THA | TG | 217 | Thai Airways |
| THE | 9D | Toumaï Air Tchad | |
| THJ | Thaijet Airlines | ||
| THT | TN | 244 | Air Tahiti Nui |
| THY | TK | 235 | Turkish Airlines |
| TII | ATI Airlines | ||
| TIS | UZ | 246 | Tesis Aviation Enterprise |
| TIT | XH | Titan Cargo Airlines | |
| TJK | 7J | 502 | Tajikair |
| TKA | Air Troika | ||
| TKE | GM | 805 | Luxavia/Flitestar/Trek Airways |
| TLA | T7 | 839 | Transaer |
| TLC | CaribEx | ||
| TLE | SH | 887 | Air Toulouse International |
| TLP | Tulipair | ||
| TLR | 7Q | 033 | Air Libya |
| TLT | KT | Turtle Airways | |
| TLX | Cargo Lion/Translux Int´l Airline | ||
| TMA | TL | 270 | Trans Mediterranean Airways |
| TMG | GY | Tri-MG Intra Asia Airlines | |
| TMM | TMC Airlines | ||
| TMN | UT | UT Air | |
| TNA | GE | 170 | Transasia Airways |
| TNO | 6R | Aerounion | |
| TNZ | Rex Aviation | ||
| TOA | Tropical Airlines | ||
| TOL | TI | Tol Air Services | |
| TOM | BY | Thomsonfly | |
| TOP | B6 | Top Air Havacilik Sanayi Ve Ticaret | |
| TOS | PM | Tropic Air | |
| TOW | FF | 305 | Tower Air |
| TPA | QT | 729 | Tampa Air Cargo |
| TPI | Topair | ||
| TPK | 8C | Air Horizon | |
| TRA | HV | 979 | Transavia Airlines |
| TRD | Trans Island Air 2000 | ||
| TRJ | E9 | 766 | AJT Air International |
| TRK | ZH | 507 | Air Truck |
| TRL | T4 | 609 | TransEast Airlines |
| TRN | LU | Theron Airways | |
| TRQ | 6N | 556 | Trans Travel Airlines |
| TRT | TO | TAAT-Trans Arabian Air Transport | |
| TRU | Triangle Airline | ||
| TRX | Air Terrex | ||
| TRZ | T9 | TransMeridian Airlines | |
| TSC | TS | 649 | Air Transat |
| TSE | TH | 539 | Transmile Air Services |
| TSK | Tomsk State Air Enterprise | ||
| TSL | Transaero Samara | ||
| TSO | UN | 670 | Transaero Airlines |
| TSQ | airtransse | ||
| TSR | Trans Service Airlift | ||
| TSU | Contract Air Cargo | ||
| TSW | BH | TEA Switzerland | |
| TSY | Tristar Air | ||
| TTA | TTA-Transporte e Trabalho Aereo | ||
| TTF | 224th Flight Unit State Airline | ||
| TTR | QS | Tatra Air | |
| TUA | T5 | 542 | Turkmenistan Airlines |
| TUI | UG | 150 | Tuninter |
| TUN | VK | 715 | Air Tungaru |
| TUP | 4B | Aviastar-Tu | |
| TUS | M3 | 549 | ABSA Aerolinhas Brasileiras |
| TVO | Transavio | ||
| TVR | T6 | 204 | Tavrey Aircompany |
| TVS | QS | Travel Service | |
| TWA | TW | 015 | Trans World Airlines |
| TWE | TQ | 227 | Transwede Airways AB |
| TWN | EC | 036 | Avialeasing |
| TXC | AL | 221 | Transaviaexport Airline |
| TYG | Trygg-Flyg | ||
| TYM | 7M | 691 | Tyumen Airlines |
| TYN | P2 | 298 | Tyumenavia |
| TYR | VO | 734 | Tyrolean Airways |
| TZK | TJ | Tajikistan International Airlines |