[steve86]

I don’t know where this screwball idea came from but the proposed aircraft certainly won’t be hypersonic at ground level.

[TexasGator]

“I don’t know where this screwball idea came from but the proposed aircraft certainly won’t be hypersonic at ground level.”

It’s to fly at altitude, not at ground level

[doorgunner69]

certainly won’t be hypersonic at ground level.

Nor are ICBMs. But they do get going after a bit of altitude to take the aerodynamic loads off.