Soaring with Solar Impulse

Solar Impulse 2 (Si2) was the first aircraft of its kind to circle the globe – flown by two Swiss pilots and making several stops along the way.

Solar Impulse pilots Bertrand Piccard, left, and André Borschberg, right, speaking at the World Economic Forum (WEF) in Davos in 2016
Bertrand Piccard (left) and André Borschberg celebrate with crew members in front of the Solar Impulse 2 in Abu Dhabi on July 26
Despite a few clouds along the way, the adventure was a blue-sky triumph.
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Analysis
Solar Impulse 2 took off on Thursday for an 18-hour flight from Phoenix, Arizona to Tulsa, Oklahoma.
This would be the solar-powered plane's second visit to Arizona – a state with great solar energy potential.
Long before Solar Impulse, the Wright brothers made history in the early 1900s.
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Pilots Piccard and Borschberg, chatting with reporters after unveiling the Si2