| 1 | TTL | Total Linhas Aéreas S/A | Callsign: Total, Merged into TRIP Linhas A�reas in May 2008. | BR | AVCODES |
| 2 | TTL | Total Linhas Aéreas S/A | Callsign: Total, Split from TRIP Linhas A�reas in May 2012. | BR | AVCODES |
| 3 | TTL | Total Linhas Aereas | | | ICAO1 |
| 4 | TTL | Thames Trains Ltd. | Real: TT, 1999: 581km standard gauge, not electrified | GB | TRAFFIC |
| 5 | TTL | TTL Ltd | | BG | VKM |
| 6 | TTLA | TOTAL TRANSPORTATION LOGISTICS (AGE | | | SCAC4 |
| 7 | TTLB | TEMPO TRUCKING LLC | | | SCAC4 |
| 8 | TTLC | TROPICAL TRAILER LEASING CORPORATION | | | PWRC |
| 9 | TTLC | Tropical Trailer Leasing Corporation | | | RSRV |
| 10 | TTLC | TOWNSEND TRUCK LINES INC | | | SCAC4 |
| 11 | TTLE | TOGETHER TRUCKING LLC | | | SCAC4 |
| 12 | TTLG | TITAN TRANSFER LOGISTICS LLC | | | SCAC4 |
| 13 | TTLH | TRANS TECH LEASING, INC | | | SCAC1 |
| 14 | TTLH | TRANS TECH LEASING INC | | | SCAC4 |
| 15 | TTLI | TAYLOR TRANSPORTATION & LOGISTICS I | | | SCAC4 |
| 16 | TTLK | T TWO (T2) LOGISTICS INC | | | SCAC4 |
| 17 | TTLL | TOTAL INTERMODAL SERVICES INC | | | SCAC4 |
| 18 | TTLN | TMT LINES INC | | | SCAC4 |
| 19 | TTLO | TRANSPORT LOU GRA INC | | | SCAC4 |
| 20 | TTLQ | TAYLOR TRUCK LINE INC | | | SCAC4 |
| 21 | TTLR | T A TRUCKING & LEASING INC | | | SCAC4 |
| 22 | TTLS | TERMINAL TRANSPORTATION CO INC | | | PWRC |
| 23 | TTLS | TUBULAR TRANSPORT & LOGISTICS LLC | | | SCAC4 |
| 24 | TTLU | TOTAL LOGISTICS LTD | | M | BIC |
| 25 | TTLU | TSINLIEN TRANSPORTATION CO LTD | | | SCAC4 |
| 26 | TTLW | TITLETOWN EXPRESS INC | | | SCAC4 |
| 27 | TTLX | Trailer Train Co. | added 1/1983; eliminated 1/1992 | | NAKINA |
| 28 | TTLX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 29 | TTLX | Trailer Train Co. (flat cars specially equipped by participant railroads with container pedestals or fixed hitches for assigned corridor intermodal service under the control of assigned participant) | added 1/1983; 7/1985 | | NAKINA |
| 30 | TTLX | Trailer Train Co./TTX Co. (specially equipped intermodal flatcars) | 10/1991-7/2000 | | NAKINA |
| 31 | TTLX | Trailer Train Co. | added 1/83; eliminated 1/92 | | NRHS |
| 32 | TTLX | TTX Co. | added 1/92 | | NRHS |
| 33 | TTLX | TTX Co. (specially equipped intermodal flatcars) | 1/94-7/2000 | | NRHS |
| 34 | TTLX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 35 | TTLX | Trailer Train (TTX Corporation) | | | RSRV |
| 36 | TTLX | TTX COMPANY | | | SCAC4 |
| 37 | TTLY | TRANSPORTES TALY S A DE C V | | | SCAC4 |
| 38 | TTLZ | TROPICAL TRAILER LEASING CORPORATION | | | PWRC |
| 39 | TTLZ | Tropical Trailer Leasing Corporation | | | RSRV |
