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German test pilot Markus Scherdel steers the solar-powered Solar Impulse 2 aircraft for its maiden flight at its base in Payerne, Switzerland Monday, June 2, 2014. The aircraft is the second solar plane of the Solar Impulse project. The main goal of the project is to circumnavigate the world with an aircraft, powered only by solar energy. (AP Photo/Denis Balibouse,Pool) ( Switzerland Solar Impulse 2 )

The solar-powered Solar Impulse 2 aircraft is airborne during its first flight Monday, June 2, 2014 in Payerne, Switzerland. (AP Photo/Fabrice Coffrini, pool) ( Switzerland Solar Impulse 2 )

A spotter takes a picture of the new experimental aircraft "Solar Impulse 2", as the sun rises during the first flight at the airbase in Payerne, Switzerland, early Monday, June 2, 2014. (AP Photo//Laurent Gillieron ,pool) ( Switzerland Solar Impulse 2 )

The new experimental aircraft "Solar Impulse 2" flies above the airbase in Payerne, Switzerland, early Monday, June 2, 2014. (AP Photo/, KeystoneLaurent Gillieron) ( Switzerland Solar Impulse 2 )

Solar Impulse Andre Borschberg checks from his helicopter German test pilot Markus Scherdel steering the solar-powered Solar Impulse 2 aircraft during its maiden flight at its base in Payerne, Switzerland, Monday June 2, 2014. (AP Photo/Denis Balibouse,pool) ( Switzerland Solar Impulse 2 )

The solar-powered Solar Impulse 2 aircraft takes off during its first flight Monday, June 2, 2014 in Payerne, Switzerland. (AP Photo/Fabrice Coffrini, pool) ( Switzerland Solar Impulse 2 )

German test pilot Markus Scherdel lands the solar-powered Solar Impulse 2 aircraft after its first flight Monday, June 2, 2014 in Payerne, Switzerland. (AP Photo/Fabrice Coffrini, pool) ( Switzerland Solar Impulse 2 )

German test pilot Markus Scherdel steers the solar-powered Solar Impulse 2 aircraft for its maiden flight at its base in Payerne, Switzerland early Monday, June 2, 2014. Picture taken from a helicopter. (AP Photo/Denis Balibouse,Pool) ( Switzerland Solar Impulse 2 )

Spectators watch under heavy clouds the a landing of solar-powered Solar Impulse 2 aircraft after its first flight on Monday June 2, 2014 in Payerne, Switzerland. (AP Photo/Fabrice Coffrini,Pool) ( Switzerland Solar Impulse 2 )

The new experimental aircraft "Solar Impulse 2" with Solar Impulse's German test pilot Markus Scherdel on board takes off during the first flight at the airbase in Payerne, Switzerland, early Monday, June 2, 2014. The aircraft HB-SIB is the second solar plane of the Solar Impulse project. (AP Photo/Laurent Gillieron, pool) ( Switzerland Solar Impulse 2 )

German test pilot Markus Scherdel steers the solar-powered Solar Impulse 2 aircraft for its maiden flight at its base in Payerne on June 2, 2014. AFP PHOTO / POOL / DENIS BALIBOUSE/AFP/Getty Images ( 530316020 )

German test pilot Markus Scherdel lands the new experimental aircraft "Solar Impulse 2", after its first flight at the airbase in Payerne, Switzerland, on June 2, 2014. AFP PHOTO / POOL / LAURENT GILLIERON/AFP/Getty Images ( 530316907 )

German test pilot Markus Scherdel flies the solar-powered Solar Impulse 2 aircraft during its first flight on June 2, 2014 in Payerne, Switzerland. AFP PHOTO / POOL / FABRICE COFFRINI/AFP/Getty Images ( 530316914 )

Solar Impulse co-founder Bertrand Piccard, left, congratulates German test pilot Markus Scherdel, right, after its maiden flight with the solar-powered Solar Impulse 2 aircraft at its base in Payerne, Switzerland Monday June 2, 2014. (AP Photo/Denis Balibouse,Pool) ( Switzerland Solar Impulse 2 )

(L to R) Swiss pilot Bertrand Piccard (L) and German test pilot Markus Scherdel and Swiss pilot Andre Borschberg pose in front of the solar-powered Solar Impulse 2 aircraft after its first flight on June 2, 2014 in Payerne. AFP PHOTO / POOL / FABRICE COFFRINI/AFP/Getty Images ( 530316514 )