Northrop YF-17 Cobra
Needing a plane for the jobs the larger and more expensive F-15s couldn’t do, the Air Force opened up the Lightweight Fighter competition in 1971. Northrop’s YF-17, which is based on their F-5E Tiger II design, may have lost out to General Dynamics YF-16, but a larger scale version of the Cobra turned into the F/A-18 Hornet.
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