Air Wisconsin Airlines Corporation operates as the largest privately held regional airline in the United States. Founded in 1965, Air Wisconsin schedules nearly 500 departures per day system-wide to 26 states and three Canadian provinces. With service to approximately 70 cities throughout North America, Air Wisconsin carries nearly 6 million passengers per year.

Air Wisconsin works in partnership with US Airways and United Airlines. In addition to the flying services Air Wisconsin provides while operating 71 CRJ regional jets as US Airways Express, the airline is also a ground-handler for United Express in United's Washington Dulles International hub and 22 other cities throughout the country.