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Specification	North American X-15 North American Aviation × remove	Soyuz U Russian Federal Space Agency (ROSCOSMOS) × remove
Flights	13	714
Success rate	92.3%	97.2%
Thrust	286 kN	—
Height	15.47 m	51.1 m
Diameter	6.61 m	2.95 m
Launch mass	15,195 t	313 t
LEO capacity	—	6,900 kg
GTO capacity	—	—
Launch cost	—	—
Reusable	Yes	No
Stages	1	3

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