A new generation of supersonic private jets could trigger a boom in luxury high-speed flight -- without the sonic boom normally associated with breaking the sound barrier.
Lockheed Martin's advanced Skunk Works unit is designing a small, 12-seat passenger jet that would travel at 1,200 mph (Mach 1.8) but which would produce only a whisper of the annoying crack once emitted by the retired Concorde.
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