| 1 | UTT | Transarabian Transportation Services Co. Ltd. | Callsign: Arabian Transport, | EAU | AVCODES |
| 2 | UTT | Transarabian Transportation Services | | | ICAO1 |
| 3 | UTTH | UTILICOR TECHNOLOGIES INC | | | SCAC4 |
| 4 | UTTI | UNIMARK TRUCK TRANSPORT INC | | | SCAC4 |
| 5 | UTTL | UNI-TRANS TRANSPORTATION LLC | | | SCAC4 |
| 6 | UTTS | UTTSA SA DE CV | | | SCAC4 |
| 7 | UTTU | DEN HARTOGH GLOBAL BV | | NL | BIC |
| 8 | UTTU | UNITED TRANSPORT TANKCONTAINERS BV | | | SCAC4 |
| 9 | UTTV | UNION TRUCK TIRE SERVICES LLC | | | SCAC4 |
| 10 | UTTX | Trailer Train Co./TTX Co. (5 platform articulated TOFC cars with rigid hitches, capable of carrying 1 trailer per platform, 40-48' long and up to 102"" wide, with nose-mounted refrigeration unit between lift-on/lift-off facilities only) | added 7/1983; 7/1985-7/2000 | | NAKINA |
| 11 | UTTX | TTX Co. | added 7/1983; added 1/1992; 1/1994-7/2005 | | NAKINA |
| 12 | UTTX | Trailer Train Co. | added 1/92 | | NRHS |
| 13 | UTTX | TTX Co. | added 1/92 | | NRHS |
| 14 | UTTX | TTX Co. (5 platform articulated TOFC cars with rigid hitches, capable of carrying 1 trailer per platform, 40-48' long and up to 102" wide, with nose-mounted refrigeration unit between lift on/lift off facilities only) | 1/94-7/2000 | | NRHS |
| 15 | UTTX | TTX COMPANY | | | PWRC |
| 16 | UTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 17 | UTTX | TTX COMPANY | | | SCAC4 |
