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. By Oct. 25, 1979, Phantom No. 5057 -- the last U.S.-built Phantom -- was being delivered to the U.S. Air Force for ultimate delivery to the Republic of Korea Air Force.