| 1 | UST | Austro Aereo, S.A. | Callsign: Austro Aereo, | EC | AVCODES |
| 2 | UST | Austro Aereo | | | ICAO1 |
| 3 | UST | UNISPED Speditions- und Transportgesellschaft mbH | | DE | VKM |
| 4 | USTB | U S TRANSPORT LLC | | | SCAC4 |
| 5 | USTC | U. S. TRUCK COMPANY, INC | | | SCAC1 |
| 6 | USTC | U S LOGISTICS INC | | | SCAC4 |
| 7 | USTC | United States of America Transport Corps | | USA | TRAFFIC |
| 8 | USTE | U S TRADING & LOGISTICS CORP | | | SCAC4 |
| 9 | USTF | U S TRANSIT | | | SCAC4 |
| 10 | USTG | UNITED STATES GOVERNMENT (FEDERAL RAILROAD ADMINISTRATION) | | | PWRC |
| 11 | USTG | U S LOGISTICS INC | | | SCAC4 |
| 12 | USTH | U S TRANSPORT INC | | | SCAC4 |
| 13 | USTI | ULTRA SERVICE TRANSPORTATION INC | | | SCAC4 |
| 14 | USTK | US STEADFAST TRUCKING LLC | | | SCAC4 |
| 15 | USTM | USTRANSMEX S A DE C V | | | SCAC4 |
| 16 | USTN | U S TRANSPORT FREIGHT SYSTEMS INC | | | SCAC4 |
| 17 | USTO | U S TRAFFIC LIMITED | | | SCAC4 |
| 18 | USTP | USA LOGISTICS & TRANSPORTATION INC | | | SCAC4 |
| 19 | USTV | UNITED SERVICE TRANSPORT LLC | | | SCAC4 |
| 20 | USTW | UNIVERSAL STUDIOS | | | SCAC4 |
| 21 | USTX | Union Starch & Refining Co. | 7/1930-7/1965; eliminated 7/1966; eliminated 10/1966 | | NAKINA |
| 22 | USTX | General American Transportation Corp. | added 10/1966; 10/1966; eliminated 1/1968; 4/1970 | | NAKINA |
| 23 | USTX | Union Starch & Refining Co. | 4/38-7/65; eliminated 7/66; eliminated 10/66 | | NRHS |
| 24 | USTX | General American Transportation Corp. | added 10/66; 10/66; eliminated 1/68; 4/70 | | NRHS |
| 25 | USTX | *UNION STARCH & REFINING CO. (GENERAL AMERICAN TRANSPORTATION CORP.) | | | PWRC |
| 26 | USTX | *USX CORP. | | | PWRC |
