One of Wisconsin's biggest tourist events opens today. Aviation enthusiasts from around the world flock to Wittman Regional Airport in Oshkosh for the 55th annual EAA AirVenture . Dick Knapinski with EAA says the Wisconsin Department of Tourism estimates AirVenture has an economic impact of more than eighty million dollars to the state. Highlights include the Air Force's new F-22 fighter, the Goodyear blimp, and the U-2 spyplane. This year's AirVenture coincides with the 60th anniversary of the U.S. Air Force.