| 1 | USX | US Express | Callsign: Air Express, | USA | AVCODES |
| 2 | USX | | | | ICAO1 |
| 3 | USXA | USA CARGO LINE | | | SCAC4 |
| 4 | USXB | U S XPRESS INC (REEFER DIVISION) | | | SCAC4 |
| 5 | USXD | U S XPRESS INC | | | SCAC4 |
| 6 | USXF | U S XPRESS INC (CONTAINER ON FLAT C | | | SCAC4 |
| 7 | USXH | U S XPRESS INC (HOME DEPOT POP UP F | | | SCAC4 |
| 8 | USXI | U.S. Express | | | SCAC2 |
| 9 | USXI | U S XPRESS INC | | | SCAC4 |
| 10 | USXJ | US TRANSPORT LLC | | | SCAC4 |
| 11 | USXL | USXL Worldwide | | | SCAC2 |
| 12 | USXL | USXL | | | SCAC4 |
| 13 | USXN | U S EXPRESS LINE | | | SCAC4 |
| 14 | USXO | U S XPRESS INC (XPRESS CONSOLIDATED | | | SCAC4 |
| 15 | USXP | U S EXPRESS | | | SCAC4 |
| 16 | USXR | U S XPRESS RAIL (DIVISION OF U S XP | | | SCAC4 |
| 17 | USXT | USMX TRANSPORT INC | | | SCAC4 |
| 18 | USXU | UNIKON SHIPPING LINE PTE LTD | | SGP | BIC |
| 19 | USXU | NORFOLK SOUTHERN CORP | | | SCAC4 |
| 20 | USXW | U S XPRESS INC (WAL-MART DEDICATED) | | | SCAC4 |
