Swiss pilot Bertrand Piccard takes a selfie with his arm outside the Solar Impulse 2 plane during the sixth leg of the round-the-world trip, from Chongqing Jiangbei International Airport to Nanjing Lukou International Airport in East China’s Jiangsu province, April 21, 2015. Pilots Piccard and Andre Borschberg will take turns at the controls of Solar Impulse 2, which began its journey in Abu Dhabi in the United Arab Emirates last month, as it makes its way around the globe in about 25 flight days at speeds of between 50 kph and 100 kph.(Photo provided to China News Service)
