Fresno Yosemite International Airport is a joint military–public airport in Fresno, California, United States. It is the primary commercial airport for the San Joaquin Valley and three national parks: Yosemite, Sequoia and Kings Canyon. It offers scheduled passenger flights to several major airline hubs in the United States and international service to Mexico. The facility opened in June 1942 as Hammer Field, a military airfield. The airport is owned and operated by the city of Fresno and operates two runways on a property spanning 1,728 acres (699 ha). Its airport code "FAT" stands for Fresno Air Terminal, a former name for the airport.