)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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