The NASA X-43A Hyper-X was a series of three unpiloted hypersonic research aircraft that demonstrated air-breathing scramjet propulsion in free flight. Each lifting-body vehicle was designed for a single test mission; the second aircraft reached Mach 6.8 and the third reached Mach 9.6 in 2004, establishing the first successful scramjet-powered aircraft flights.
Alerts for directly linked future launches and major activity.