X-59：美国宇航局的静音超音速试验喷气机首飞
这款99英尺长的单座X-59飞机经过调校，能够在以1.4马赫的速度巡航时将震耳欲聋的音爆转变为柔和的“咚”声。接下来将进行社区飞行；如果噪音数据能够说服监管机构，持续了50年的陆地超音速航线禁令或许将迎来重新审视的机会。
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The 99-ft, single-seat X-59 is tuned to turn the window-shaking boom into a soft “thump” while cruising at Mach 1.4. Community flights start next; if the noise data wins over regulators, the 50-year ban on over-land supersonic routes could finally get a rethink.