| 1 | TCO | Aero Transcolombiana de Carga Ltda. | Callsign: Transcolombia, IATA Prefix: 826, Founded in 1993. Ceased operations during 1999. | CO | AVCODES |
| 2 | TCO | Aerotranscolombina de Carga | | | ICAO1 |
| 3 | TCOA | TRANSPORT CORPORATION OF AMERICA IN | | | SCAC4 |
| 4 | TCOB | TRI-CON INC | | | SCAC4 |
| 5 | TCOC | TRASCO CORPORATION | | | SCAC3 |
| 6 | TCOC | TRANSPORTES COVILLI S A DE C V | | | SCAC4 |
| 7 | TCOD | TANCO DISTRIBUTING COMPANY | | | SCAC3 |
| 8 | TCOD | TRANSCON INC (BROKERAGE DIVISION) | | | SCAC4 |
| 9 | TCOE | TRENCO INC | | | SCAC3 |
| 10 | TCOE | TECO LINES | | | SCAC4 |
| 11 | TCOF | TALCO TRANSFER INC | | | SCAC3 |
| 12 | TCOH | TECOPA HOT SPRINGS TRANSPORTATION I | | | SCAC3 |
| 13 | TCOI | TRANSPORTATION CONSOLIDATORS INC | | | SCAC3 |
| 14 | TCOI | T C M LOGISTICS LLC | | | SCAC4 |
| 15 | TCOJ | TRENTON CORPORATION | | | SCAC4 |
| 16 | TCOK | TOMCO INC | | | SCAC3 |
| 17 | TCOK | TRANSPORT CORPORATION OF AMERICA IN | | | SCAC4 |
| 18 | TCOL | TRAVEL COLORADO INC | | | SCAC3 |
| 19 | TCOM | TRIANON CORPORATION, MONROVIA/LIBER | | | SCAC3 |
| 20 | TCOM | TRAMITES DE COMERCIO INTERNACIONAL | | | SCAC4 |
| 21 | TCOMBI | Transcombi S.A. Galati | | RO | TRAFFIC |
| 22 | TCOO | TRI TECH LOGISTICS LTD | | | SCAC4 |
| 23 | TCOP | THORCO TRANSPORT INC | | | SCAC3 |
| 24 | TCOP | TRANS COPEAUX INC | | | SCAC4 |
| 25 | TCOQ | TRI-CO TRANSPORT INC | | | SCAC3 |
| 26 | TCOQ | TRANSPORT MCCOOL | | | SCAC4 |
| 27 | TCOR | TAYLOR COURIER SERVICE | | | SCAC4 |
| 28 | TCOS | TRI-COUNTY SERVICE COMPANY | | | SCAC3 |
| 29 | TCOT | TRANSPORT COMPANY OF TEXAS, THE | | | SCAC3 |
| 30 | TCOU | JSC TECO | | RUS | BIC |
| 31 | TCOU | Town & Country | | GB | TRAFFIC |
| 32 | TCOX | Trinity Cotton Oil Co. | 8/1920-4/1947 | | NAKINA |
| 33 | TCOX | Trinity Cotton Oil Division of The Best Foods, Inc. | 1/1950-1/1952; eliminated 1/1953 | | NAKINA |
| 34 | TCOX | The Concrete Co. | 7/2000 (not listed) | | NAKINA |
| 35 | TCOX | Lafarge North American Inc. | added 4/2005; 7/2005 | | NAKINA |
| 36 | TCOX | Trinity Cotton Oil Co. | Apr-38 | | NRHS |
| 37 | TCOX | Trinity Cotton Oil Division of The Best Foods, Inc. | 1/52; eliminated 1/53 | | NRHS |
| 38 | TCOX | The Concrete Co. | Jul-00 | | NRHS |
| 39 | TCOX | *BEST FOODS, INC., TRINITY COTTON OIL DIVISION | | | PWRC |
| 40 | TCOX | +LAFARGE NORTH AMERICA, INC. [THE CONCRETE CO.] | | | PWRC |
| 41 | TCOX | The Concrete | | | RSRV |
| 42 | TCOX | LAFARGE NORTH AMERICA INC | | | SCAC4 |
| 43 | TCOZ | TERMINAL CONSOLIDATION COMPANY | | | PWRC |
| 44 | TCOZ | Terminal Consolidation | | | RSRV |
| 45 | TCOZ | TERMINAL CONSOLIDATION COMPANY | | | SCAC4 |
