Buchanan Field Airport is a county-owned public-use airport in Contra Costa County, California, United States, located one mile (1.6 km) west of the center of Concord and east of the unincorporated community of Pacheco. The airport's street address is 550 Sally Ride Drive, Concord.The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a reliever airport. It has a control tower.HistoryIn 1942 Contra Costa County, California purchased land for an airport in Central County for $88,000. The airport was being developed by the County until the United States Army Air Forces Fourth Air Force expropriated the site. The Army added land and built airport facilities and a training base for pilots, Concord Army Air Base.In 1946 the War Assets Administration (WAA) returned the airport to the County. In 1947 the transfer was formalized and the airport was named for County Supervisor William J. Buchanan, who served on the County Board of Supervisors for more than forty years. The airport continued to be used on occasion by the U.S. Army to transport troops, especially during the Korean War.