737 MAX winglet. Courtesy, Boeing Boeing’s newly announced winglet technology is expected to be the last major change to the 737 MAX before the aircraft design is finalized, the program’s chief engineer said Wednesday. Boeing revealed it was incorporating a new, all-Boeing developed winglet into the 737 MAX design that should give the aircraft up to a 1.5% fuel-burn improvement on top of the 10%-12% improvement that the new-engine MAX is expected to provide over ...

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