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Associated Press
Ground crew members stand next to the Solar Impulse solar-powered plane that was on display during a press conference 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. The Solar Impulse is powered by about 12,000 photovoltaic cells that allow it to fly without jet fuel. It has the wing span of a commercial airplane but the weight of the average family car. (AP Photo/Tony Avelar)

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