This was the first civilian flight to climb above 80 km. As it was a U.S. flight and the U.S. recognizes the beginning of space as 80 km (instead of the 100 km Kármán line used by the rest of the world) this counts as a suborbital spaceflight on the U.S. record of human spaceflights.
Crafts
X-15
The X-15 was a supersonic rocket aircraft for the U.S. Air Force and NASA. Thirteen of its flights climbed higher than 80 km, the U.S. boundary to space. Two flights rose above 100 km, the internationally recognized border to space.
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