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  • SpaceLiner concept jet could fly at Mach 25


    Courtesy German Aerospace Center via CNN

    London to Melbourne in 90 minutes? Paris to San Francisco in under an hour?

    That's travel at 25 times the speed of sound -- or barely enough time to take in an in-flight movie.

    Few areas of aviation generate wilder predictions than hypersonic flight ...

    View More
    By Miquel Ros for CNN


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