An unmanned aircraft with the appearance of a flying manta ray could herald the future of jetliners. NASA and Boeing's flying lab has wrapped up the first series of flight tests that should help pave the way for less noisy, more fuel-efficient airplanes that also emit less pollution.
The 500-pound X-48B aircraft celebrated its 80th and last flight of the project's first phase on March 19, 2010, or almost three years after its first flight on July 20, 2007.
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