Appleton International Airport, formerly Outagamie County Regional Airport, is an airport located in Outagamie County, Wisconsin, United States, just west of Appleton in the town of Greenville. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a non-hub primary commercial service facility. It is the fourth-busiest commercial airport in Wisconsin in terms of passengers served.