| The X-30 was to use scramjet (a supersonic ramjet) as propulsion and its propellants were liquid hydrogen and atmospheric oxygen.
It was also proposed that the X-30 could be modified into an airliner. By using the X-30's scramjet propulsion, flights between any 2 points around the earth at mach 12 would take less tnan 2 hours. For this reason, the aerospace plane was referred to as the Orient Express.
The X-30 Project was cancelled in 1993.
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