Workers assemble Boeing Co. next-generation 737 airplanes, Tuesday, Jan. 29, 2013 at the company's 737 assembly facility in Renton, Wash. On Jan. 25, 2013, Boeing began assembling next-generation 737 passenger airplanes at an increased rate of 38 planes per month. (AP Photo/Ted S. Warren)

Associated Press
Workers assemble Boeing Co. next-generation 737 airplanes, Tuesday, Jan. 29, 2013 at the company's 737 assembly facility in Renton, Wash. On Jan. 25, 2013, Boeing began assembling next-generation 737 passenger airplanes at an increased rate of 38 planes per month. (AP Photo/Ted S. Warren)
Workers assemble Boeing Co. next-generation 737 airplanes, Tuesday, Jan. 29, 2013 at the company's 737 assembly facility in Renton, Wash. On Jan. 25, 2013, Boeing began assembling next-generation 737 passenger airplanes at an increased rate of 38 planes per month. (AP Photo/Ted S. Warren)
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