The company had decades of experience in producing highly detailed models that pilots and aerospace engineers purchased, and used its sources in the United States military and defense contractors. The Testor Corporation produced a F-19 scale model. During the decade many news articles discussed what they called the “F-19”. The United States received the first Lockheed F-117 stealth fighter in 1982. Despite this, the designations YF-17 and YF-23 were not skipped (although YF-20, YF-17 and YF-23 all were prototypes and did not enter production phase).
)The truth behind this jump in numbers is Northrop pressed the designation “YF-20” as they wanted an even number, in order to stand out from the Soviet odd-numbered designations. The USAF finally approved the F-20 designation in 1982. The USAF proposed the F-19 designation for the fighter, but Northrop requested the “F-20” instead. After the F/A-18 Hornet, the next announced aircraft was the YF-20 Tigershark. F-13 was never assigned to a fighter due to triskaidekaphobia, though the designation had previously been used for a reconnaissance version of the B-29. fighters have been designated by consecutive numbers, beginning with the F-1 Fury. Since the unification of the numbering system in 1962, U.S. F-19 is the designation for a hypothetical US fighter aircraft that has never been officially acknowledged, and has engendered much speculation that it might refer to a type of aircraft whose existence is still classified.
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