| 1 | TTJ | Tatra Jet, s.r.o. | Callsign: Tatra, | SK | AVCODES |
| 2 | TTJA | TEMP TRANS LLC | | | SCAC4 |
| 3 | TTJB | TRANSPORT J B | | | SCAC4 |
| 4 | TTJC | TATLOCK, J & C & SON TRANSPORT LTD | | | SCAC4 |
| 5 | TTJF | TSJ TRANSPORT INC | | | SCAC4 |
| 6 | TTJJ | TIMBERLINE TRANSPORT INC | | | SCAC4 |
| 7 | TTJK | TTD TRANSPORT | | | SCAC4 |
| 8 | TTJL | TRIGUEROS TRUCKING | | | SCAC4 |
| 9 | TTJM | TRANSPORTES AJM | | | SCAC4 |
| 10 | TTJP | T & T TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 11 | TTJQ | TILLERY TRUCKING INC | | | SCAC4 |
| 12 | TTJR | TOP TRUCKING CORP | | | SCAC4 |
| 13 | TTJT | TRUAX, THOMAS JAMES, TRUCKING | | | SCAC1 |
| 14 | TTJT | TRANSPORTES JESUS TORRES TORRES | | | SCAC4 |
| 15 | TTJX | Trailer Train Co. | added 4/1970; 4/1970-1/1980; eliminated 1/1992 | | NAKINA |
| 16 | TTJX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 17 | TTJX | Trailer Train Co. (90-ton flat cars with special tie-down devices, fixtures and stake pockets) | added 4/1970; 4/1970 | | NAKINA |
| 18 | TTJX | Trailer Train Co./TTX Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets) | 1/1975-1/1994 | | NAKINA |
| 19 | TTJX | TTX Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets, equipped with end of car cush.) | 7/2000 | | NAKINA |
| 20 | TTJX | Trailer Train Co. | added 4/70; 4/70 | | NRHS |
| 21 | TTJX | Trailer Train Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets) | 1/75-1/80; eliminated 1/92 | | NRHS |
| 22 | TTJX | TTX Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets) | added 1/92; 1/94 | | NRHS |
| 23 | TTJX | TTX Co. (68', 90-ton flat cars with special tie-down devices, fixtures and stake pockets, equipped with end of car cush.) | Jul-00 | | NRHS |
| 24 | TTJX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 25 | TTJX | Trailer Train (TTX Corporation) | | | RSRV |
| 26 | TTJX | TTX COMPANY | | | SCAC4 |
| 27 | TTJY | THOMSON TRUCKING INC | | | SCAC4 |
