| 1 | TTP | Triple O. Aviation Ltd. | Callsign: Mighty Wing, | WAN | AVCODES |
| 2 | TTP | Triple O Aviation | | | ICAO1 |
| 3 | TTPA | TRITON TRANSPORT LTD | | | SCAC4 |
| 4 | TTPC | THORMAN TRANSPORTATION COMPANY | | | SCAC4 |
| 5 | TTPC | Toronto Transportation Commission | | CDN | TRAFFIC |
| 6 | TTPE | TOTAL TRANSPORTATION ENTERPRISES | | | SCAC1 |
| 7 | TTPE | TRANSPORTADORA TEPEYAC SA DE CV | | | SCAC4 |
| 8 | TTPG | TURNER TRANSPORTATION GROUP INC | | | SCAC4 |
| 9 | TTPH | TRIUMPH TRANSPORT INC | | | SCAC4 |
| 10 | TTPI | TRITOP INC | | | SCAC4 |
| 11 | TTPJ | TRIANGLE TRANSPORT, INC | | | SCAC1 |
| 12 | TTPJ | TRIANGLE TRANSPORT INC | | | SCAC4 |
| 13 | TTPK | TETREAULT, PATRICK TRANSPORT 2006 I | | | SCAC4 |
| 14 | TTPO | TRAZ TRANSPORT INC | | | SCAC4 |
| 15 | TTPQ | TRANSPORTES ISA | | | SCAC4 |
| 16 | TTPR | TRANSPORT PIERRE ROCQUE INC | | | SCAC4 |
| 17 | TTPS | TARPON TRANSPORTATION SERVICES INC | | | SCAC4 |
| 18 | TTPT | TEAM TRANSPORT INCORPORATED | | | SCAC4 |
| 19 | TTPU | PS TRADE TRANS SP Z O O | | | SCAC4 |
| 20 | TTPV | TOTAL TRANSPORTATION SERVICES INC | | | SCAC4 |
| 21 | TTPW | TATE TRANSPORTATION INC | | | SCAC4 |
| 22 | TTPX | Trailer Train Co. | 4/1970-1/1980; eliminated 1/1992 | | NAKINA |
| 23 | TTPX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 24 | TTPX | Trailer Train Co./TTX Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc.) | 4/1970-1/1994 | | NAKINA |
| 25 | TTPX | TTX Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc., equipped with end of car cush.) | 7/2000 | | NAKINA |
| 26 | TTPX | Trailer Train Co. | Apr-70 | | NRHS |
| 27 | TTPX | Trailer Train Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc.) | 1/75-1/80; eliminated 1/92 | | NRHS |
| 28 | TTPX | TTX Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc.) | added 1/92; 1/94 | | NRHS |
| 29 | TTPX | TTX Co. (flat cars equipped with bulkheads spaced 62' apart and 17 transverse tie-down anchors with chains; used for transporting wallboard, plywood, etc., equipped with end of car cush.) | Jul-00 | | NRHS |
| 30 | TTPX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 31 | TTPX | Trailer Train (TTX Corporation) | | | RSRV |
| 32 | TTPX | TTX COMPANY | | | SCAC4 |
| 33 | TTPY | TRICAN TRANSPORT LTD | | | SCAC4 |
| 34 | TTPZ | CANADIAN NATIONAL | | | PWRC |
| 35 | TTPZ | Canadian National Railway | | | RSRV |
| 36 | TTPZ | CANADIAN NATIONAL RAILWAYS | | | SCAC4 |