| 1 | UTL | Aviatia Utilitara SA | Callsign: Av Util, Ceased operations. | RO | AVCODES |
| 2 | UTL | Umwelt-Transport-Logistik GmbH | Konstanz | D | privat-bahn.de |
| 3 | UTL | Umwelt+Transportlogistik AG | | CH | VKM |
| 4 | UTLC | UNITED TRADE LOGISTIC INC | | | SCAC4 |
| 5 | UTLD | ULTIMA TRANSPORT LLC | | | SCAC4 |
| 6 | UTLH | UNDERWOOD TRUCKING LLC | | | SCAC4 |
| 7 | UTLJ | ULTIMATE TRANSPORT LLC | | | SCAC4 |
| 8 | UTLK | UTL INTERNATIONAL INC | | | SCAC4 |
| 9 | UTLL | UNITED TRANS LOGISTICS INC | | | SCAC4 |
| 10 | UTLM | ULTIMATE TRANSPORTATION LLC | | | SCAC4 |
| 11 | UTLT | UTL TRANSPORTATION SERVICES (DIVISI | | | SCAC4 |
| 12 | UTLU | Universal Truckload Services | | | RSRV |
| 13 | UTLV | UTICA LIVESTOCK CARRIERS | | | SCAC4 |
| 14 | UTLW | UKA TRANSPORTATION LLC | | | SCAC4 |
| 15 | UTLX | Union Tank Line Co. (Union Tank Car Co.) | 8/1920-7/1935 | | NAKINA |
| 16 | UTLX | Union Tank Car Co. | 7/1937-7/1965 | | NAKINA |
| 17 | UTLX | Union Tank Line Co. (Union Tank Car Co.) | 10/1966 | | NAKINA |
| 18 | UTLX | Union Tank Car Co. | 4/1970-7/2005 | | NAKINA |
| 19 | UTLX | Union Tank Car Co. | 4/38-7/65 | | NRHS |
| 20 | UTLX | Union Tank Line Co. (Union Tank Car Co.) | Oct-66 | | NRHS |
| 21 | UTLX | Union Tank Car Co. | 4/70-7/2000 | | NRHS |
| 22 | UTLX | (UTCX) UNION TANK CAR CO | | | PWRC |
| 23 | UTLX | Union Tank Car | | | RSRV |
| 24 | UTLX | UNION TANK CAR COMPANY | | | SCAC4 |
| 25 | UTLX | Union Tank Car Co. | | USA | TRAFFIC |
| 26 | UTLY | UTLEY INCORPORATED | | | SCAC4 |
| 27 | UTLZ | UNITED TRAILER LEASING CO | | | PWRC |
| 28 | UTLZ | United Trailer Leasing | | | RSRV |
| 29 | UTLZ | UNITED TRAILER LEASING CO | | | SCAC4 |
