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Associated Press
United Airlines CEO Jeff Smisek accepts a a model of Boeing's new 737 Max 9 from Boeing Commercial Airplanes CEO Ray Conner, left, during a news conference, Thursday, July 12, 2012, in Chicago. United Airlines and Boeing announced that United is buying 150 Boeing 737s, and is planning to use them to replace older planes that are not as fuel efficient.(AP Photo/M. Spencer Green)

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