| 1 | TTA | Transportes E Trabalho Aero | Name changed to TTA - Empresa Nacional de Transporte e Trabalho A�reo | MOC | AVCODES |
| 2 | TTA | TTA - Sociedade de Transporte e Trabalho Aereo | | | ICAO1 |
| 3 | TTAC | TRANSPORTES A C | | | SCAC4 |
| 4 | TTAD | TRANSPORTES ARANDAS | | | SCAC4 |
| 5 | TTAF | TICO TRANSPORT | | | SCAC4 |
| 6 | TTAG | T & T EVERGREEN | | | SCAC4 |
| 7 | TTAH | TSP TRUCKING LLC | | | SCAC4 |
| 8 | TTAJ | TRANSPORTES ANDRES JIMENEZ | | | SCAC4 |
| 9 | TTAL | TRANSPORT ALAIN SIGOUIN | | | SCAC4 |
| 10 | TTAO | TRANSPORTES ARO | | | SCAC4 |
| 11 | TTAR | TRANSTAINER CORPORATION | | | SCAC1 |
| 12 | TTAR | TRACKDOWN TOWING & RECOVERY | | | SCAC4 |
| 13 | TTAT | T & T TRANSPORTS INC | | | SCAC4 |
| 14 | TTAU | TRET SRL | | I | BIC |
| 15 | TTAU | TRET SPA | | | SCAC4 |
| 16 | TTAX | Trailer Train Co. | added 4/1968; 10/1968-1/1980; eliminated 1/1992 | | NAKINA |
| 17 | TTAX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 18 | TTAX | Trailer Train Co. | added 4/1968 | | NAKINA |
| 19 | TTAX | Trailer Train Co. (89'4"" FC flats equipped with container adaptors, trailer hitches and bridge plates. Equipped with hydraulic draft gear) | 10/1968 | | NAKINA |
| 20 | TTAX | Trailer Train Co. (flush deck flat cars equipped with movable foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | 4/1970 | | NAKINA |
| 21 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | 1/1975 | | NAKINA |
| 22 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, hitches and bridge plates; for transporting trailers or containers or combinations of both) | 1/1980-7/1985 | | NAKINA |
| 23 | TTAX | Trailer Train Co./TTX Co. (skeletonized, 5-unit, articulated all-purpose car for use between lift-on/lift-off facilities only, capable of carrying various combinations of trailers and/or containers of various lengths and widths) | 10/1991-7/2000 | | NAKINA |
| 24 | TTAX | Trailer Train Co. | added 4/68 | | NRHS |
| 25 | TTAX | Trailer Train Co. (89'4" FC flats equipped with container adaptors, trailer hitches and bridge plates. Equipped with hydraulic draft gear) | Oct-68 | | NRHS |
| 26 | TTAX | Trailer Train Co. | Apr-70 | | NRHS |
| 27 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | Jan-75 | | NRHS |
| 28 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, hitches and bridge plates; for transporting trailers or containers or combinations of both) | Jan-80 | | NRHS |
| 29 | TTAX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 30 | TTAX | TTX Co. | added 1/92 | | NRHS |
| 31 | TTAX | TTX Co. (skeletonized, 5-unit, articulated all-purpose car for use between lift on/lift off facilities only, capable of carrying various combinations of trailers and/or containers of various lengths and widths) | 1/94-7/2000 | | NRHS |
| 32 | TTAX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 33 | TTAX | Trailer Train (TTX Corporation) | | | RSRV |
| 34 | TTAX | TTX COMPANY | | | SCAC4 |
