"Roper declined to comment on how many prototype aircraft have been flown or which defense contractors manufactured them. He wouldn’t say when or where the firs

"Roper declined to comment on how many prototype aircraft have been flown or which defense contractors manufactured them. He wouldn’t say when or where the first flight occurred. And he refused to divulge any aspect of the aircraft’s design — its mission, whether it was uncrewed or optionally crewed, whether it could fly at hypersonic speeds or if it has stealth characteristics." We don't even know that there was a pilot. All we know is that a jet aircraft was produced in a fairly rapid timeframe.