I'm with you on this one Mark - go for it. If the PA says nothing, end the day happy. If the PA tells you to stop, then stop and go on your way. I've been approached by PAPD in T4 about photographing airside and they just told me (perhaps in a not so nice manner) to stop. So I did and went on my way. They can't arrest you for something that isn't illegal. That said, stay away from TSA, security checkpoints, and customs/immigration facilities; those I have heard are quite stringent about cameras.
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