Visitors take shelter from a sand storm as the wind blows across the airport and halts flying displays during the 13th Dubai Airshow at Dubai World Central (DWC) in Dubai, United Arab Emirates, on Sunday, Nov. 17, 2013. The 13th edition of the biennial 2013 Dubai Airshow, the Middle East’s leading aerospace event organized by F&E Aerospace. Photographer: Jason Alden/Bloomberg