Grant County International Airport — Moses Lake, United States

Grant County International Airport, coded MWH, is located in Moses Lake, Washington, and occupies the site of the former Larson Air Force Base, a legacy that gave it an unusually long runway by civilian standards. This extended runway has made MWH a prized location for aircraft testing, pilot training programs including Japan Airlines' training academy, and emergency diversion landings for large commercial jets. The airport supports general aviation, cargo operations, and limited commercial passenger service alongside its significant aerospace testing activity. Its high-desert location and minimal air traffic congestion make it attractive for flight schools and manufacturers conducting certification flights. MWH's Cold War-era military origins continue to shape its modern identity as a specialized aviation testing and training hub in central Washington.