This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A ramjet airplane engine designed for hypersonic flight that burns fuel in the supersonic airstream produced by the plane.

n. A jet engine capable of propelling an aircraft at hypersonic speeds; combustion of the fuel/air mixture occurs at supersonic speeds

"Recent breakthroughs in scramjet engines could mean two-hour flights from New York to Tokyo."

pulsejet    turbojet   

8-week    search/recommendation    eleven-hour    vibration-free    cross-strait    ticketslast    twostroke    t-38    fourstroke    repulsorlift