Bertrand Piccard, left, Solar Impulse Initiator, Chairman and Pilot and André Borschberg, right, Solar Impulse Co-Founder, CEO and Pilot, smile during a press conference with the Solar Impulse solar-powered plane at Moffett Airfield, NASA Ames Research Center in Mountain View, Calif., on Thursday, March 28, 2013. A solar-powered plane that has wowed aviation fans in Europe is set to travel across the United States with stops in Phoenix, Dallas, Washington, D.C., and New York, organizers of the trip announced Thursday. (AP Photo/Tony Avelar)
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