Pilots Bertrand Piccard, left, and André Borschberg watch as the Solar Impulse landed after a test flight at Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, April 19, 2013. A solar-powered plane that has wowed aviation fans in Europe is set to take an early morning test flight over the San Francisco Bay area. Considered the world's most advanced sun-powered plane, the Solar Impulse is set to take off from Moffett Field in Mountain View at first light for a two-hour practice run leading up to the start of a multi-city, cross-country tour. (AP Photo/Jeff Chiu)

Associated Press
Pilots Bertrand Piccard, left, and André Borschberg watch as the Solar Impulse landed after a test flight at Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, April 19, 2013. A solar-powered plane that has wowed aviation fans in Europe is set to take an early morning test flight over the San Francisco Bay area. Considered the world's most advanced sun-powered plane, the Solar Impulse is set to take off from Moffett Field in Mountain View at first light for a two-hour practice run leading up to the start of a multi-city, cross-country tour. (AP Photo/Jeff Chiu)
Pilots Bertrand Piccard, left, and André Borschberg watch as the Solar Impulse landed after a test flight at Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, April 19, 2013. A solar-powered plane that has wowed aviation fans in Europe is set to take an early morning test flight over the San Francisco Bay area. Considered the world's most advanced sun-powered plane, the Solar Impulse is set to take off from Moffett Field in Mountain View at first light for a two-hour practice run leading up to the start of a multi-city, cross-country tour. (AP Photo/Jeff Chiu)
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