Bertrand Piccard (L) pilot and co-founder of Solar Impulse talks to his counterpart Andre Borschberg (2ndR) before the start of a transatlantic 72 hour flight simulation at the airport in Duebendorf ... more 
Bertrand Piccard (L) pilot and co-founder of Solar Impulse talks to his counterpart Andre Borschberg (2ndR) before the start of a transatlantic 72 hour flight simulation at the airport in Duebendorf near Zurich December 17, 2013. Swiss long-range solar-powered aircraft project Solar Impulse HB-SIB airplane is expected to be completed by the end of 2013. Flight testing is planned for spring 2014, and the first solar-powered round-the-world flight for sometime between April and July 2015. REUTERS/Arnd Wiegmann (SWITZERLANDTRANSPORT TECHNOLOGY - Tags: SCIENCE TECHNOLOGY TRANSPORT) HEADSHOT) less 
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Reuters | Photo By ARND WIEGMANN / REUTERS
Tue, Dec 17, 2013 6:57 AM EST