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[–] 3 points 4 months ago

I haven't looked it up but I would bet you it's due to fatigue limits. They probably use aluminum a lot which always fatigues no matter how light the stress (a bit like me tbh...) so anything made from aluminum gets retired after a set time period.

The same is true for jets. Each flight expands and contracts the airframe since it's a pressure vessel, and the wings can deflect a large amount too.

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