Employees install a MC-21 flight simulator of a Russian single-aisle airliner, at Paris Air Show, on the eve of its opening, in Le Bourget, east of Paris, France, Sunday, June 18, 2017. While Airbus and Boeing will again hog the spotlight at the Paris Air Show with their battle for ever-larger slices of the lucrative pie in the sky, a lot of the really interesting stuff will be going on elsewhere at next week's massive biennial aviation and defense industry gathering. (AP Photo/Michel Euler)
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