After World War II, the Army Air Forces vacated the facility and Drew Field was returned to the City of Tampa. The Peter O. Knight Airport and Drew Field reversed roles as the main Tampa airport because Drew Field was greatly expanded by the United States Army Air Forces during the war years. Airlines (Eastern Air Lines and National Airlines) moved to Drew Field from Peter O. Knight Airport on Davis Island, which was too small to handle the Douglas DC-4, DC-6 and Lockheed Constellation prop-liners then coming on line in the mid-1940s. During this period, the airlines were housed in the former Drew AAF Base Operations building.