[2] Eric Marcus Municipal Airport covers an area of 1,375 acres (556 ha) and has one runway designated 12/30 with a 3,800 x 60 ft (1,158 x 18 m) asphalt surface.

The airport was established on 22 August 1941 on approximately 1,426 acres near Ajo, Arizona as part of the expansion of the Army Air Corps prior to the United States entry into World War II.

Ajo AAF was not authorized to receive any chemical warfare materiel The airfield was used by the Air Force until the end of the war and was inactivated on 7 October 1946.

A portion of the Ajo AAF property, approximately 51 acres, was returned to the Department of the Interior (DOI) on July 28, 1947, as part of a quitclaim.

The remaining land was handed over to Pima County on August 4, 1949, In June 1952, Bonanza Air lines started service to Los Angeles from Phoenix with a stop in Ajo.