That’s a beauty but no comparison to the XB-70, “Valkyrie!”
I saw the aircraft while I was taxiing an Ohio ANG T-33 on Wright Patterson AFB, Ohio.1959..
I almost taxied off the ramp because I could not take my eyes off of the big bird.
It was flown into Wright Patt. to be put into the US Air Force Museum.
The other prototype was lost in a, tragic, midair collision.
I got to see it later at a 42nd Bomb Wing Reunion. It is on display at Wright Patt. with the “Experimentals,” and the “Presidential” Airplanes. 2013.
If seeing the bird doesn’t take your breath away, you are not involved, at all, in aviation!