49th International Paris Air Show 2011 [Getty Images]

An employee adjusts the rotor blades on a model Mi-171A2 helicopter on the OAO Russian Helicopters' stand at the Paris Air Show in Paris, France, on Wednesday, June 22, 2011. The 49th International Paris Air Show, the world's largest aviation and space industry show, takes place at Le Bourget airport June 20-26. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

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