Mach 10 or bust!

“They call it a “scramjet,” an engine so blindingly fast that it could carry an airplane from San Francisco to Washington, D.C., in about 20 minutes — or even quicker. So fast it could put satellites in space. So fast it could drop a cruise missile on an enemy target, almost like shooting a rifle.”
‘Scramjet’ shoots for Mach 10

Very cool, thanks Greg!