Hypersonic vehicles that we work on today want to be above 50,000 feet [not down to sea level]… You don’t see any exhaust plumes [in the FLIR video], and they would show up in this type of [infrared] image. The shape is wrong. The flight regime, the point in the sky it flies to is wrong. How it flies is wrong.

— Steve Justice
Director, Advanced Systems Development at Skunkworks, Lockheed Martin
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