Assertion: spacecraft's flight | /r/CapableOf | reach maximum altitude
Facets:
value: above 50 miles
type: OTHER
Source sentences:
text: In addition to the above spaceflights, eleven flights of the North American X-15 reached a maximum altitude above 50 miles but below 100 kilometers, thus satisfying the U.S. definition of spaceflight but failing to surpass the Kármán line.