Willow Run Airport (IATA: YIP, ICAO: KYIP, FAA LID: YIP) is an airport in Van Buren Charter Township and Ypsilanti Township, near Ypsilanti, Michigan, United States that serves freight, corporate, and general aviation. Due to its proximity to Detroit Metropolitan Airport, no major airlines schedule passenger flights to or from Willow Run. 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 national reliever airport facility.