Air Wisconsin Airlines Corporation is a regional airline based at Outagamie County Regional Airport in the town of Greenville, Wisconsin, United States, near Appleton. Air Wisconsin is the largest privately held regional airline in the United States. It operates regional jet flights as US Airways Express under contract to US Airways, serving 69 cities in the US and Canada with hubs at Philadelphia International Airport and Ronald Reagan Washington National Airport.The airline is also a ground-handler for United Express at 17 locations and for US Airways at 3 locations. - Source: Wikipedia