Wittman Regional Airport is an airport located on the south side of Oshkosh, Wisconsin. The airport is owned and operated by Winnebago County. The airport is the site of the annual Experimental Aircraft AssociationsAirVenture Oshkosh, an experimental aircraft and sport aviation airshow. Across Knapp St. to the west lies the campus of the E.A.A. AirVenture Museum. For the week of AirVenture Oshkosh (known locally as "The Airshow"), Wittman Regional is the busiest airport in the world. Oshkosh is a city located where the Fox River enters Lake Winnebago in Winnebago County, Wisconsin. ... Winnebago County is a county located in the state of Wisconsin. ... The Experimental Aircraft Association (EAA) is an international organization of aviation enthusiasts based in Oshkosh, Wisconsin. ... This article needs to be cleaned up to conform to a higher standard of quality. ...