"According to Mr. Bland, aircraft manufacturers have been collecting data since the 1970s to determine the maximum stress that planes experience in turbulence, and they then design aircraft to withstand one and a half times that. In fact, a video clip available on YouTube shows Boeing’s test of the wing of a 777; using cables, the wing is bent upward about 24 feet at the tip before it breaks."
That's from a NYT story for those who have to step on the plane a lot.
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