just watching the news...my friends say damm...i would never flythat!....i say this......12500 mph 40 miles up....HELL YA!!!!!!!!!!!!! they are the shit......i would love to go right now...to be a part of the baddest friggin piece of machinery (hotrod) in the world......can anyone imagine going 170mph in a flat bottom?????what a rush...how about 12,500mph.in a plane...sign me up!.i love the usa and what it stands for...and god bless the astronauts,,they did something that people dream about....godspeed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!