| 1 | SOX | Solid Air | Callsign: Solidair, AOC suspended on 28 September 2011. Declared bankrupt on 07 October 2011. | NL | AVCODES |
| 2 | SOX | Solid Air | | | ICAO1 |
| 3 | SOX | Slimp Oil Co. | 7/1937 | | NAKINA |
| 4 | SOX | SLIMP OIL CO. | | | PWRC |
| 5 | SOXA | SANDPRO TRUCKING LLC | | | SCAC4 |
| 6 | SOXC | SEAPORT TRANSPORTATION INC | | | SCAC4 |
| 7 | SOXI | SACRAMENTO TRANSFER INC | | | SCAC4 |
| 8 | SOXT | SEAOCEANTRANSPORTINC | | | SCAC4 |
| 9 | SOXU | AIR LIQUIDE SINGAPORE PRIVATE LIMITED | | SGP | BIC |
| 10 | SOXU | SINGAPORE OXYGEN AIR LIQUIDE PTE LT | | | SCAC4 |
| 11 | SOXV | SIMS TRANSPORTATION SERVICES | | | SCAC4 |
| 12 | SOXX | FLAGSHIP RAIL SERVICES LLC | | | SCAC4 |
