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I can't be certain, but i wouldn't think the x-ray scanners at an airport are strong enough to de-magnetize a dock. I've heard rare cases of them harming unshielded magnetic media (such as tapes and ID cards), and even that is very uncommon.
I imagine if it did de-magnetize it, and you can safely open the dock, you could probably just pop a similar-sized magnet in its place.