A view of tables displaying Marconi and Edison electronic equipment of the type installed in the YF-4K (Phantom) prototype aircraft at the McDonnell Douglas aircraft factory at Saint Louis, Missouri. A number of Phantom aircraft are parked in the background. 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.