| 1 | WSN | Air Wisconsin Airlines Corporation (AWAC) | IATA: ZW, Callsign: Wisconsin, IATA Prefix: 303, ICAO designator changed to AWI. ICAO Callsign changed from Air Wisconsin | USA | AVCODES |
| 2 | WSN | Advanced Air, LLC | IATA: AN, Callsign: Wingspan, | USA | AVCODES |
| 3 | WSN | Washington Southern Ry. (Richmond, Fredericksburg & Potomac Ry.) | 8/1920-7/1923 | | NAKINA |
| 4 | WSN | RICHMOND, FREDERICKSBURG & POTOMAC RWY. [WASHINGTON SOUTHERN RWY.] | | | PWRC |
| 5 | WSNB | WESTERMA | | | SCAC4 |
| 6 | WSNJ | WILSON, JAMES COMPANY | | | SCAC4 |
| 7 | WSNM | WESTON TRANSPORTATION INC | | | SCAC4 |
| 8 | WSNO | WEST STAR TRANSPORTATION INC | | | SCAC4 |
| 9 | WSNQ | WESTERN TRANSPORT | | | SCAC4 |
| 10 | WSNU | WILHELM STUHRENBERG GMBH & CO. KG | | D | BIC |
| 11 | WSNU | WILHELM STUHRENBERG GMBH & CO KG | | | SCAC4 |
| 12 | WSNY | WALLEM SH | | | SCAC4 |
