| 1 | WSS | Vilga-Aviaservice | Callsign: Vilga-Service, | KZ | AVCODES |
| 2 | WSS | Winston-Salem Southbound Ry. Co. | 8/1920-7/2005 | | NAKINA |
| 3 | WSS | Winston-Salem Southbound Ry. Co. | 4/38-7/2000 | | NRHS |
| 4 | WSS | (CSXT) WINSTON-SALEM SOUTHBOUND RAILWAY CO. | | | PWRC |
| 5 | WSS | Winston-Salem Southbound Railway | | | RSRV |
| 6 | WSS | WINSTON-SALEM SOUTHBOUND RAILWAY CO | | | SCAC4 |
| 7 | WSSC | WESTERN SALT COMPANY | | | SCAC4 |
| 8 | WSSH | WALL STREET SYSTEMS OF OHIO LLC | | | SCAC4 |
| 9 | WSSJ | WORLD SHIP SUPPLY SOUTHEAST LLC | | | SCAC4 |
| 10 | WSSK | Rail Cargo Carrier – Slovakia s.r.o. | | SK | VKM |
| 11 | WSSL | WESTERN STATES PETROLEUM INC | | | SCAC4 |
| 12 | WSSM | WESTSIDE MOVING & STORAGE | | | SCAC4 |
| 13 | WSSO | WISSOTA TRANSPORT LLC | | | SCAC4 |
| 14 | WSSR | WESTSTAR | | | SCAC4 |
| 15 | WSSU | WILHELMSEN SHIPS SERVICE GEORGIA LLC | | GE | BIC |
| 16 | WSSX | Wedron Silica Co. | added 4/1986; 1/1994-7/2005 | | NAKINA |
| 17 | WSSX | Wedron Silica Co. | added 4/86; 1/94-7/2000 | | NRHS |
| 18 | WSSX | WEDRON SILICA CO. | | | PWRC |
| 19 | WSSX | Wedron Silica | | | RSRV |
| 20 | WSSX | WEDRON SILICA COMPANY | | | SCAC4 |
| 21 | WSSY | WILLIN SPECIALIZED SERVICES INC | | | SCAC4 |
