| 1 | SWX | Steffen Air Charter Services d/b/a Swazi Express Airways | IATA: Q4, Callsign: Swazi Express, Ceased operations on 04 April 2008. | SD | AVCODES |
| 2 | SWX | Swazi Express Airways | | | ICAO1 |
| 3 | SWX | The Sherwin-Williams Co. | 8/1920-1/1941; 1/1943-1/1946 (not listed) | | NAKINA |
| 4 | SWX | The Sherwin-Williams Co. | Apr-38 | | NRHS |
| 5 | SWX | SHERWIN-WILLIAMS CO. | | | PWRC |
| 6 | SWXC | SEVEN TWO SIX SEVEN ONE FIVE ONE (7 | | | SCAC4 |
| 7 | SWXE | STATE-WIDE EXPRESS, INC | | | SCAC1 |
| 8 | SWXE | STATE-WIDE EXPRESS INC | | | SCAC4 |
| 9 | SWXF | SWIFT TRANSPORTATION COMPANY INC (F | | | SCAC4 |
| 10 | SWXG | SWING TRANSPORT INC (DEDICATED DIV) | | | SCAC4 |
| 11 | SWXH | SANDWOOD TRANSPORT INC | | | SCAC4 |
| 12 | SWXI | SOUTHWEST EXPRESS INC | | | SCAC4 |
| 13 | SWXN | SPEED WAY TRANSPORTATION LLC | | | SCAC4 |
| 14 | SWXO | SOUTHWEST TRANSPORTATION | | | SCAC4 |
| 15 | SWXP | STAR WAY TRANSPORT LLC | | | SCAC4 |
| 16 | SWXS | SEAWAY EXPRESS | | | PWRC |
| 17 | SWXS | SPRING WATER EXPRESS INC | | | SCAC4 |
| 18 | SWXY | SWAD AUTO TRANSPORTERS INC | | | SCAC4 |
