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The response of a variety of "skin" materials at these speeds have already been tested in real word situations. Rocket-powered missiles that fly this fast have been around for years & there's the Shuttle.
The new tech that's being tested is the scramjet engine. If it works, they'll eventually decide whether or not the same engine will be used for subsonic flight & supersonic flight. If so, it will convert from a turbojet to a ramjet while in flight at well over Mach 1. If not, an aircraft would need separate engines for different speeds.