Pilot Bertrand Piccard talks about Solar Impulse, the Swiss solar-powered airplane, at 

Pilot Bertrand Piccard talks about Solar Impulse, the Swiss solar-powered airplane, at Sky Harbor International Airport in Phoenix, early Saturday, May 4, 2013, after completing the first leg of its coast-to-coast flights across the United States. It is the first time that a solar airplane capable of flying day and night without fuel, will attempt to fly across America. Solar Impulse began its journey Friday in San Francisco in its attempt to reach New York. (AP Photo/Scuteri)
Associated Press
Pilot Bertrand Piccard talks about Solar Impulse, the Swiss solar-powered airplane, at Sky Harbor International Airport in Phoenix, early Saturday, May 4, 2013, after completing the first leg of its coast-to-coast flights across the United States. It is the first time that a solar airplane capable of flying day and night without fuel, will attempt to fly across America. Solar Impulse began its journey Friday in San Francisco in its attempt to reach New York. (AP Photo/Scuteri)
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