Boeing this week will begin assembling the first 737NG to be built at the increased production rate of 42 aircraft per month. Since 2010, production of the 737 has increased about 33%, from 31.5 to 42 aircraft a month, its highest rate ever. According to Boeing, on Wednesday, mechanics at the Renton, Wash. factory will load initial parts of the spars—internal support structures in the wings—into an automated spar-assembly machine. The spar is the first step in building the wings ...

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