<http://schema.org/description>
"Virgin Galactic's first commercial spacecraft was carried to 46,000 ft, released, and then propelled by rocket to 69,000 ft in testing leading up to commercial launch in 2014."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pfonline.com/news/virgin-galactics-spaceshiptwo-completes-second-rocket-powered-flight>