A starboard side view, taken from just ahead of the beam, of the Royal Navy Fleet Air Arm YF-4K1 (Phantom) prototype aircraft, serial XT595, moving under her own power at the McDonnell Douglas aircraft factory at Saint Louis, Missouri. She has a crew of two and the cockpit canopies are closed. The completion to first flight status of the two prototype aircraft for the Royal Navy's Fleet Air Arm was the reason for a press viewing day at the factory. YF-4K1 (serial XT595) first flew 26 June 1966 and left the factory for the Edwards Air Force Base 21 July 1966. YF-4K2 (serial XT596) first flew 30 August 1966.