interesting...blunt bodies always form detached shockwaves at very high speed
I see what they are doing but I'd imagine getting an airplane out of it, as opposed to a missile, would be difficult
I wish they'd declassify the SR71's flight envelope...about as close to a functional hypersonic platform as we've come...Space shuttle excepted, too heavy and cumbersome for a plane ---and it explodes a lot...

my guess regarding the blackbird is M 4.0 @ FL 900...