On May 24, 1978 the 5000th Phantom II was delivered in ceremonies that marked the 20th anniversary of the first flight of the twin-engine, two-person fighter. More than 600 guests attended the event that presented the aircraft to the U.S. Air Force. With pomp and ceremony, the aircraft was unveiled, sporting a special paint job that featured the flags of all the nations currently flying the F-4. At the time, the Phantom II had the longest production run of any supersonic fighter and the run was expected to continue for several more years.