A member of the ground crew walks near the Rolls-Royce Holdings Plc Trent 900 engine of an Airbus SAS A380 aircraft, operated by British Airways, on the first day of the Paris Air Show in Paris, France, on Monday, June 17, 2013. The 50th International Paris Air Show is the world&#39;s largest aviation and space industry show, and takes place at Le Bourget airport June 17-23. Photographer: Chris Ratcliffe/Bloomberg via Getty Images