Boeing will introduce folding wings to commercial aviation when the 777X airliner enters service at the end of 2019. But the devices could become commonplace on future aircraft as wingspans increase in an effort to reduce drag and fuel burn. The 777X has almost 24 ft. more wingspan than today’s 777 to optimize lift distribution and maximize cruise efficiency. Folding the tips on the ground keeps the larger aircraft compatible with existing taxiway and gate size restrictions. But NASA ...

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