- Oshkosh Airport, also known as Wittman Regional Airport, is a public airport located in Winnebago County, Wisconsin, United States. It is situated approximately two miles southwest of the central business district of Oshkosh and primarily serves general aviation and air charter operations. Oshkosh Airport is most known for hosting the annual EAA AirVenture Oshkosh, one of the largest aviation events in the world, where thousands of aircraft and aviation enthusiasts gather. The airport has two runways and a variety of facilities, including a control tower, terminal building, and maintenance hangars.