El Mirage Flight Test Facility, California
This small airport is used for flight testing related to the development of Unmanned Aerial Vehicles (UAVs), which are small, remotely operated aircraft used primarily for intelligence gathering (though also for weapons delivery). Facilities consist of small hangar structures, support buildings, and a runway, adjacent to El Mirage Dry Lake in the Antelope Valley. Operated by the Aeronautical Systems division of San Diego-based General Atomics, which developed the Predator, Gnat, Grey Eagle, and Reaper UAVs among others. The company also owns Gray Butte Field Airport (previously operated by McDonnell Douglas/Boeing as a aircraft radar cross-section testing facility), located south of El Mirage.