| 1 | TCI | Turks & Caicos Airways | IATA: QW, Callsign: Turk National, IATA Prefix: 254, | TC | AVCODES |
| 2 | TCI | Turks & Caicos Airways (2003) Ltd | Callsign: Kerrmont, | TC | AVCODES |
| 3 | TCI | Amber Aviation Limited | Callsign: Amber, Established in February 2017. | PRC | AVCODES |
| 4 | TCI | Air Turks and Caicos | IATA: JY | | ICAO1 |
| 5 | TCIA | TRANSPORTES GRACIA | | | SCAC4 |
| 6 | TCIB | TRANSPORTATION CONCEPTS INC | | | SCAC3 |
| 7 | TCIC | TRAIL CAR INC | | | SCAC3 |
| 8 | TCID | TRANSPORT CONCEPTS INTERNATIONAL IN | | | SCAC4 |
| 9 | TCIG | TRAVEL CONNECTION INC | | | SCAC3 |
| 10 | TCIH | T C INSTANT EXPRESS INC | | | SCAC3 |
| 11 | TCII | TRANSCONEX INTERNATIONAL INC | | | SCAC3 |
| 12 | TCII | TRANSCONEX INTERNATIONAL INC | | | SCAC4 |
| 13 | TCIJ | TIANJIN CONSOL LINES | | | SCAC4 |
| 14 | TCIK | TIGER CREEKTRANSPORT INC | | | SCAC4 |
| 15 | TCIL | TWIN-CITY LIMITED INC | | | SCAC3 |
| 16 | TCIL | TRANSPORTES DE CARGA INTERNACIONAL | | | SCAC4 |
| 17 | TCIM | TRANSPORT COMMANDO INC | | | SCAC4 |
| 18 | TCIO | TCI TRUCKING | | | SCAC3 |
| 19 | TCIO | TCI TRUCKING | | | SCAC4 |
| 20 | TCIP | TRANS CARGO INC | | | SCAC4 |
| 21 | TCIQ | TRI-CITY TRANSFER & STORAGE INC | | | SCAC3 |
| 22 | TCIR | T R A C E INTERNATIONAL INC | | | SCAC3 |
| 23 | TCIS | TRANSPORTATION & CONSOLIDATION SERV | | | SCAC3 |
| 24 | TCIT | TWIN CITY TRUCKING INC | | | SCAC3 |
| 25 | TCIT | TIPS COMPANIES INC | | | SCAC4 |
| 26 | TCIU | TITAN CONTAINERS A/S | | DK | BIC |
| 27 | TCIU | TECORE INTERNATIONAL LTD | | | SCAC3 |
| 28 | TCIU | TITAN CONTAINERS INTERNATIONAL A/S | | | SCAC4 |
| 29 | TCIV | T C I TRANSPORTATION SERVICES INC | | | SCAC4 |
| 30 | TCIW | TRIPLE C TRANSPORTATION SERVICES IN | | | SCAC4 |
| 31 | TCIX | Tennessee Coal, Iron and R.R. Co. | 8/1920-7/1954; eliminated 7/1957 | | NAKINA |
| 32 | TCIX | Trinity Chemical Leasing, L.L.C. | added 4/2000; 7/2000; eliminated 10/2000; added 1/2003; eliminated 4/2003; 7/2005 (not listed) | | NAKINA |
| 33 | TCIX | Tennessee Coal, Iron and Railroad Co. | 4/38-1/52 | | NRHS |
| 34 | TCIX | Trinity Chemical Leasing, L.L.C. | added 4/2000; 7/2000; eliminated 10/2000 | | NRHS |
| 35 | TCIX | *TENNESSEE COAL, IRON & RAILROAD CO. | | | PWRC |
| 36 | TCIX | +TRINITY CHEMICAL LEASING, LLC | | | PWRC |
| 37 | TCIX | Trinity Chemical Leasing | | | RSRV |
| 38 | TCIX | TRINITY CHEMICAL LEASING LLC | | | SCAC4 |
| 39 | TCIY | TLC CONSTRUCTION | | | SCAC4 |
| 40 | TCIZ | TRIPLE CROWN SERVICES INC | | | SCAC4 |