FSX – Scenery Willians Gateway (KIWA), Arizona (AZ), USA. 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, 20 miles (32 km) southeast of Phoenix, in Maricopa County, Arizona, United States. The airport is owned and operated by the Phoenix-Mesa Gateway Airport Authority. The airport authority is governed by a six 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, city of Phoenix, and the city of Apache Junction. By Fernando Angel Gonzalez.