FILE- In this Wednesday, May 22, 2013, file photo, the Solar Impulse, 

FILE- In this Wednesday, May 22, 2013, file photo, the Solar Impulse, piloted by André Borschberg, takes flight during the second leg of the 2013 Across America mission, at dawn, at Harbor International Airport in Phoenix. The solar-powered plane neared the close of a cross-continental journey and landed at Dulles International Airport outside the nation's capital early Sunday, June 16, 2013, only one short leg to New York remaining. (AP Photo/Matt York, File)
Associated Press
FILE- In this Wednesday, May 22, 2013, file photo, the Solar Impulse, piloted by André Borschberg, takes flight during the second leg of the 2013 Across America mission, at dawn, at Harbor International Airport in Phoenix. The solar-powered plane neared the close of a cross-continental journey and landed at Dulles International Airport outside the nation's capital early Sunday, June 16, 2013, only one short leg to New York remaining. (AP Photo/Matt York, File)
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