Phoenix-Mesa Gateway Airport (IATA: AZA, ICAO: KIWA, FAA LID: IWA), formerly Williams Gateway Airport (1994–2008) and Williams Air Force Base (1941–1993), is a commercial airport located in the southeastern area of the city of Mesa, Arizona, and 20 miles (32 km) southeast of Phoenix, in Maricopa County, Arizona, United States. The airport is owned and operated by the Williams Gateway Airport Authority. It serves as a focus city for Allegiant Air. The airport authority is governed by a five member board, composed of the mayors and tribal governor of the town of Gilbert, city of Mesa, town of Queen Creek, Gila River Indian Community and the city of Phoenix.
According to the FAA's National Plan of Integrated Airport Systems for 2007–2011, Phoenix-Mesa Gateway was designated as a reliever airport, which is a general aviation airport that may be used to relieve congestion at a large commercial service airport. Allegiant Air began offering scheduled commercial service from this airport in October 2007. As per Federal Aviation Administration records, the airport had 289,770 passenger boardings (or enplanements) in the calendar year 2009, a 52.29% increase over the previous year.
Phoenix-Mesa Gateway Airport was built in 1941 and inaugurated in 1942 by the United States military as Williams Air Base. It served as a flight training field during World War II for military pilots. Military forces established a pilot school there, and many war airplanes that are now considered to be classics were seen there on a daily basis. " source: Wikipedia