Borschberg smiles with Piccard before flying the Solar Impulse 2, at Al Bateen airport in Abu Dhabi

Borschberg smiles with Piccard before flying the Solar Impulse 2, at Al Bateen airport in Abu Dhabi

Swiss pilot Andre Borschberg (R) smiles with his compatriot pilot Bertrand Piccard before flying the Solar Impulse 2, at Al Bateen airport in Abu Dhabi, at the start of an attempt to fly around the world in the solar-powered plane 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 ENERGY TPX IMAGES OF THE DAY)