YF-22 and YF-23. Wikipedia
This Is What Regret Looks Like To The US Air Force -- Business Insider
Back in 1997, the US Air Force choose between the F-22 Raptor and the YF-23 for its fifth-generation fighter.
The YF-23 had a greater flight range, giving the fighter the potential to strike much further targets.
The F-22 Raptor had a more conventional design and more effective program management, and was seen as less costly and less risky.
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WNU Editor: For more info on the YF-23, go here.