| 1 | TCQ | Amber Aviation San Marino S.r.l. | Callsign: Amsan, | RSM | AVCODES |
| 2 | TCQC | TRANSPRO CONTRACT CARRIERS INC | | | SCAC4 |
| 3 | TCQF | TRUCKCRAFT CORPORATION | | | SCAC4 |
| 4 | TCQG | T & C TRUCKING LLC | | | SCAC4 |
| 5 | TCQI | TCA S R L | | | SCAC3 |
| 6 | TCQL | TRICLOR LIMITED | | | SCAC3 |
| 7 | TCQM | TRANSPORTES CAL-MAR | | | SCAC4 |
| 8 | TCQN | TC INC | | | SCAC4 |
| 9 | TCQO | TRANCO LOGISTICS LLC | | | SCAC4 |
| 10 | TCQQ | TRANSPORTES CADI | | | SCAC4 |
| 11 | TCQT | TATCAN TRUCKING INC | | | SCAC3 |
| 12 | TCQU | Transport Canada | | | RSRV |
| 13 | TCQX | Thrall Car Manufacturing Co. | added 4/2000; 7/2000; eliminated 1/2002 | | NAKINA |
| 14 | TCQX | Trinity Rail Management, Inc. | added 4/2002; 7/2005 | | NAKINA |
| 15 | TCQX | Thrall Car Manufacturing Co. | added 4/2000; 7/2000 | | NRHS |
| 16 | TCQX | TRINITY RAIL MANAGEMENT, INC. [THRALL CAR MANUFACTURING CO.] | | | PWRC |
| 17 | TCQX | Trinity Rail Management | | | RSRV |
| 18 | TCQX | TRINITY RAIL MANAGEMENT | | | SCAC4 |
