EAA AirVenture Oshkosh - The World's Greatest Aviation Celebration - For one week each summer, EAA members and aviation enthusiasts totaling more than 500,000 from more than 60 countries attend EAA AirVenture at Wittman Regional Airport in Oshkosh, Wisconsin, where they rekindle friendships and celebrate the past, present and future in the world of flight. "The World's Greatest Aviation Celebration" has it all when it comes to aircraft. Warbirds. Vintage. Homebuilts. Ultralights. And more!