https://www.zerohedge.com/technology/company-making-hypersonic-air-force-one
"The partnership will allow for the development of a hypersonic aircraft for the presidential fleet, that can travel as fast as Mach 5. Hermeus successfully tested a Mach 5 engine prototype earlier this year. A demonstrator vehicle using the Mach 5 engines could be seen within the next five years."
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Meanwhile other things are still happening.
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