Miami-Opa Locka Executive Airport (formerly Opa-locka Airport and Opa-locka Executive Airport until 2014) is a joint civil-military airport located in Miami-Dade County, Florida north of downtown Miami. Part of the airport is in the city limits of Opa-locka. The National Plan of Integrated Airport Systems for 2011–2015 called it a general aviation reliever airport. The FAA-contract control tower is manned from 7:00 AM to 11:00 PM. The airport has four fixed-base operators. It is owned by Miami-Dade County and operated by the Miami-Dade Aviation Department. The sole remaining military activity at the airport is Coast Guard Air Station Miami, operating from federal property not deeded to the county. It hosts EADS HC-144 Ocean Sentry turboprops; and MH-65 Dolphin helicopters for coastal patrol, deployment aboard medium endurance and high endurance coast guard cutters, and air-sea rescue. Much of CGAS Miami's facilities were built during World War II as part of Naval Air Station Miami. DayJet provided on-demand jet air charter services to 44 airports in 5 states; it filed for Chapter 7 bankruptcy liquidation in 2008. The airport is served by several cargo and charter airlines that use the U.S. customs facility. Maintenance and modification of airliners up to Boeing 747 size is carried out by several aviation firms. History Aviation pioneer Glenn Curtiss retired from aircraft development and manufacturing in the 1920s and became a real estate developer in Florida. In 1926, he founded the city of Opa-locka, naming it Opa-tisha-woka-locka (quickly shortened to Opa-locka), a Native American name that translates into the high land north of the little river with a camping place. In late 1925, he moved the Florida Aviation Camp from Hialeah to a parcel west of Opa-locka. This small airfield was surrounded by the Opa-locka Golf Course. In 1929, he transferred the land to the City of Miami, which erected a World War I surplus hangar from Key West. The field became known as the Municipal Blimp Hangar. The following year, the Goodyear Blimp started operating out of this hangar. In 1928, Curtiss made a separate donation of land two miles south of Opa-locka for Miami's first Municipal Airport. The Curtiss Aviation School later moved from Biscayne Bay to this airport. A larger area to the east of Miami Municipal Airport was developed during the 1930s as All-American Airport. After Curtiss died in 1930, his estate transferred a parcel of land north of the golf course