Question: Both the Appleton International Airport and the Pellston Regional Airport are categorized as what by the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021?
Sentence (from "Appleton International Airport"): Appleton International Airport (IATA: ATW, ICAO: KATW, FAA LID: ATW) , formerly "Outagamie County Regional Airport", is an airport located in Outagamie County, Wisconsin, United States, just west of Appleton in the town of Greenville.
Relevant evidence: No