Solar Impulse, the Swiss solar-powered airplane, piloted by Bertrand Piccard, is shown 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 USA. 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
Solar Impulse, the Swiss solar-powered airplane, piloted by Bertrand Piccard, is shown 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 USA.  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)
Solar Impulse, the Swiss solar-powered airplane, piloted by Bertrand Piccard, is shown 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 USA. 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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