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Associated Press
FILE - In this file photo taken Feb. 28, 2011, Southwest Airlines planes are shown at McCarran International Airport in Las Vegas. Boeing (NYSE: BA) and Southwest Airlines today announced a firm order for 150 fuel-efficient 737 MAX airplanes. Southwest is the first customer to finalize an order for the 737 MAX and becomes the launch customer for the new-engine variant. The Dallas-based carrier also ordered 58 Next-Generation 737s. (AP Photo/Ted S. Warren, File)

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