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Sure they are. But still, why? Yet to see an o-ring supported on the interior and not the exterior. If it is captured why would it matter? Flying pressures are nowhere near diving pressures. Just very curious to this explanation.
I usually leave my housing open while flying, but once in a while, I forget.
After I land, I find it very difficult to open the housing which I attribute to the pressure change. My o-rings are alright, and my camera doesn't flood, but can easily see how this might be bad for the o-rings, at the very least, it is probably not good for them.