If the X-44 would have been stealthier than the F-22, it stands to reason that it was the impetus behind the NGAD program.
Finally: USAF Upgrades X-44 MANTA To 6th Generation Fighter Jet
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Meet the X-44 Manta: What the New NGAD Stealth Fighter Will Look Like?
x 44 manta towards 6th generation, the F 35 and F 22 are shifted