NASA believes its supersonic X-Plane will slice our cross-country flight times in half
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Most of the pricey machines NASA outlined in a 2019 budget proposal this week — a 32-story mega-rocket, moon landers, and Mars rover — will be launched to Earth's orbit or beyond. 

But aside from those big-ticket items, the space agency's budget also requests funding for a curious airplane that currently exists only in sketches and the minds of NASA engineers: The X-Plane. 

This aircraft is designed to travel faster than the speed of sound, and to do so relatively quietly, without sending sonic...


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