LOTS OF PLANS. NO PLANES. Boeing is far from the only company considering a future in which we travel at Mach Five. In June 2017, Lockheed Martin announced plans to begin development on the SR-72, a hypersonic military aircraft, though it doesn't expect the craft to be airborne until 2030. In February, researchers in China successfully tested a scaled-down version of their hypersonic I Plane in an air tunnel, reaching a speed of Mach Seven. That craft could also facilitate military operations, a source told the South China Morning Post — if it ever goes into development.
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