Mach 20

DARPA, the makers of nightmarish herky-jerky Terminator robots, also made an unmanned vessel called the Falcon Hypersonic Technology Vehicle 2, that traveled for 3-minutes at an astonishing Mach 20 -- 20 times the speed of sound -- before its skin peeled off.

That's 13,000 miles per hour.

The flight test was conducted last August and the Pentagon just now released the results. 13,000 miles per hour.

I wonder what Yeager thought of it. Probably didn't like the "unmanned" part.