11 : Airfields of the United States Army Air Forces in California|Airports in San Bernardino County, California|Ontario, California|American Theater of World War II|Military in San Bernardino County, California|USAAF Contract Flying School Airfields|USAAF Western Flying Training Command|Military airbases established in 1942|Military installations closed in 1947|1942 establishments in California|1947 disestablishments in California