[an1sotropy]

Thanks for these details.

I think others might be forgetting (or not know) that the factors of safety* for the parts in airplanes (around 2, or less?) are very different than factors of safety for the structural parts of bridges (around 5?). Compared on those terms, planes are light and fragile, on purpose, so you can't f around with cheating tolerances.

* https://en.wikipedia.org/wiki/Factor_of_safety