Pinal Airpark, Arizona

This airport is the site of one of the largest commercial aircraft maintenance and storage facilities in the nation, and is one of less than a dozen aircraft storage boneyards in the southwestern USA. It was constructed as Marana Army Airfield during World War Two, as a training field, with five outlying airfields. During the Vietnam War, the airfield was dominated by the CIA, and used as one of the Agency's primary facilities for global covert air operations. A number of CIA false front aviation companies operated here, including Intermountain Airlines. While a CIA presence continued through the Cold War, today it is owned by the county, and usually has around 200 commercial airliners being stored, repaired, or disassembled on site. Most of this business is conducted by Marana Aerospace Solutions (formerly Evergreen Maintenance Center), which performs heavy maintenance on 747s and other airliners. Until 2011, EMC was a subsidiary of Evergreen Aviation, a large air cargo company (based in McMinnville, Oregon, where it operates an aviation museum). In 2011, EMC was taken over by Relativity Capital, who changed the name. The military still uses portions of the airfield as well, mostly the Silverbell Heliport at the northern end, which is a major Apache attack helicopter training base for the National Guard.