[ko_kyi]

how does this flight compare to the old X-15 flights? higher or lower, faster or slower?

[Dallas59]

From 1959 through 1968 a decade-long research program employed the North American Aviation X-15 to explore hypersonic flight and technologies needed for space flight. The X-15's pioneering flights set records that still have not been broken four decades later, including a top speed of Mach 6.7 (4,520 mph) and a peak altitude of 354,200 feet (67 miles). While doing this it gathered engineering and scientific data needed to develop new families of aircraft and spacecraft, including the Space Shuttle.

Space Ship One flew 62 miles. The next will try to reach 158 miles...I may be wrong.