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...wing, between the inboard engine cluster and the fuselage. Used to launch X-15 rocketplanes (some of whose pilots flew high enough to earn their astron ..."mothership" idea continues to be used, most recently by the winner of the X-Prize, SpaceShip One, and followup craft. There is also a rumored secret Ai

*{{space|X-30|X-30}} <BR/> *{{space|X-33|X-33}}

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