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The US is currently conducting test flights of a new X-51A WaveRider jet that is capable of hitting a top speed of Mach 6 (4,300mph / 6,900km/h) - which would allow it to travel from London to New York in
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Beginning in 1969, the Concorde - the world's first supersonic passenger jet - ferried travelers across the Atlantic in just over three hours. But there were several challenges associated with the
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