Air launching a vehicle to orbit is not new. Orbital ATK has been releasing the Pegasus rocket from a Lockheed L-1011 for 21 years and Virgin Galactic is poised to begin test flights of the LauncherOne from beneath the WhiteKnightTwo (WK2) carrier aircraft sometime next year. But the enormous carrier vehicle under development by Vulcan Aerospace’s Stratolaunch Systems takes the concept to an entirely new level. The six-engine, 385-ft.-span aircraft is designed to loft medium rockets ...

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