Borschberg (R) and Piccard get ready to fly the Solar Impulse 2 at Al Bateen airport in Abu Dhabi

Swiss pilot Andre Borschberg (R) and his compatriot pilot Bertrand Piccard get ready to fly the Solar Impulse 2 at Al Bateen airport in Abu Dhabi March 9, 2015. Piccard and Borschberg, on Monday embarked on an attempt to fly around the world on the solar-powered airplane that is expected to last for five months and is aimed at promoting clean technology in the aviation sector. On its five-month journey of 35,000 km (22,000 miles), the engines will be powered only by solar energy. REUTERS/Ahmed Jadallah (UNITED ARAB EMIRATES – Tags: TRANSPORT ENVIRONMENT ENERGY TPX IMAGES OF THE DAY)