Pentagon wants extreme hypersonic flight

Extreme hypersonic flight at Mach 20 - or 20 times the speed of sound - would enable the Pentagon to deploy troops anywhere in the world in under an hour.

NASA scramjet accelerates hypersonic flight

NASA, along with a number of international partners, is currently working on the HIFiRE (Hypersonic International Flight Research Experimentation Program) program to advance hypersonic flight.