| 1 | TTZ | Transair Limited | IATA: TZ, Callsign: Transair, Formed by the merger of Central Northern Airways and Arctic Wings in 1956. Merged into Pacific Western Airlines on 01 November 1979. | CDN | AVCODES |
| 2 | TTZ | TILCON TOMASSO | | | PWRC |
| 3 | TTZA | TRANS-TRADE INC | | | SCAC4 |
| 4 | TTZC | TOTAL PETROLEUM LLC | | | SCAC4 |
| 5 | TTZD | TRANSPORTES THREE (3) DIAMANTES | | | SCAC4 |
| 6 | TTZE | TWO TWO ZERO EIGHT EIGHT ONE TWO (2 | | | SCAC4 |
| 7 | TTZG | TOTAL LEASING & LOGISTICS | | | SCAC4 |
| 8 | TTZH | T-TRADER SEVEN LTD | | | SCAC4 |
| 9 | TTZI | TWO TWO ZERO FIVE ONE THREE FOUR (2 | | | SCAC4 |
| 10 | TTZJ | T-TRADER NINE LTD | | | SCAC4 |
| 11 | TTZK | TRYSLYN TRANSPORTATION INC | | | SCAC4 |
| 12 | TTZL | TRANSI TAINER TERMINALS LTD | | | SCAC4 |
| 13 | TTZN | TRANS-TRADE INC | | | SCAC4 |
| 14 | TTZS | T & T EXPRESS | | | SCAC4 |
| 15 | TTZT | TESTED & TRIED TRUCKING CO INC | | | SCAC4 |
| 16 | TTZV | TRANSPORTES ZAVE | | | SCAC4 |
| 17 | TTZW | TERRY TRUCKING COMPANY | | | SCAC4 |
| 18 | TTZX | Trailer Train Co. | eliminated 1/1992 | | NAKINA |
| 19 | TTZX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 20 | TTZX | Trailer Train Co./TTX Co. (flat cars equipped with bulkheads and centre beams with tie-down systems for lumber loading) | 10/1991-1/1994 | | NAKINA |
| 21 | TTZX | TTX Co. (flat cars equipped with bulkheads and centre beams with tie-down systems for lumber loading, equipped with end of car cush.) | 7/2000 | | NAKINA |
| 22 | TTZX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 23 | TTZX | TTX Co. | added 1/92 | | NRHS |
| 24 | TTZX | TTX Co. (flat cars equipped with bulkheads and centre beams with tie-down systems for lumber loading) | Jan-94 | | NRHS |
| 25 | TTZX | TTX Co. (flat cars equipped with bulkheads and centre beams with tie-down systems for lumber loading, equipped with end of car cush.) | Jul-00 | | NRHS |
| 26 | TTZX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 27 | TTZX | Trailer Train (TTX Corporation) | | | RSRV |
| 28 | TTZX | TTX COMPANY | | | SCAC4 |
| 29 | TTZY | TWO TWO FOUR NINE NINE ZERO SEVEN ( | | | SCAC4 |
| 30 | TTZZ | FLEXI-VAN LEASING INC | | | SCAC4 |
