High Quality Content by WIKIPEDIA articles! Air Midwest, Inc., was a Federal Aviation Administration Part 121 certificated air carrier operating under air carrier certificate number AMWA510A issued on May 15, 1965. It was headquartered in Wichita, Kansas,United States, and was a subsidiary of Mesa Air Group. It operated flights as US Airways Express, including a code share with Midwest Airlines, and as Mesa Airlines. It served 28 cities in 12 states.