Folding wings have a long history in aviation. Particularly in the military world, where the ability to fit more fighting planes on a boat made a very real difference to the outcomes of a combat situation. In civil aviation, though, particularly at commercial scales, the idea has been less popular.

As unattractive as complexity can be, the push for ever greater efficiency and performance may be changing things in this space. In coming years, you might find yourself boarding an airliner and watching the wings fold out prior to take off, in a way that once unthinkable for a conventional commercial aircraft.

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