| 1 | WMA | Watermakers Air | Callsign: Watermakers, | USA | AVCODES |
| 2 | WMAA | WERNER, MIKE TRUCKING INC | | | SCAC4 |
| 3 | WMAE | WARLAND, MARIANNE | | | SCAC4 |
| 4 | WMAF | WEISMAN ART FOUNDRY | | | SCAC4 |
| 5 | WMAG | WATER MAGIC | | | SCAC4 |
| 6 | WMAI | WESTBY, MARK & ASSOCIATES INC | | | SCAC4 |
| 7 | WMAJ | WESTERN MOUNTAIN TRANSPORT INC | | | SCAC4 |
| 8 | WMaJ | Vittsjö - Markaryd Järnväg | 1892 - 1897 | S | svenska-lok.se |
| 9 | WMAM | WILLIAM AMERICA | | | SCAC4 |
| 10 | WMATA | Washington Metropolitan Area Transit Authority | | USA | TRAFFIC |
