
thumb|right|A fictitious F-19 design as a scale model F-19 is a skipped DoD designation in the Tri-Service fighter aircraft designation sequence which was thought by many popular media outlets to have been allocated to the Lockheed F-117 Nighthawk. The designation was actually skipped at Northrop's request, to avoid confusion with the MiG-19.
thumb|right|A fictitious F-19 design as a scale model F-19 is a skipped DoD designation in the Tri-Service fighter aircraft designation sequence which was thought by many popular media outlets to have been allocated to the Lockheed F-117 Nighthawk. The designation was actually skipped at Northrop's request, to avoid confusion with the MiG-19.
==History== Since the unification of the numbering system in 1962, U.S. fighters have been designated by consecutive numbers, beginning with the F-1 Fury. 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. After the F/A-18 Hornet, the next announced aircraft was the F-20 Tigershark. The USAF proposed the F-19 designation for the fighter, but Northrop requested "F-20" instead. The USAF finally approved the F-20 designation in 1982. The truth behind this jump in numbers is that Northrop pressed the designation "F-20" as they wanted an even number, to stand out from the Soviet odd-numbered designations.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).