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We are going to Cozumel and wondered if we could wear BCD's on the airplane. TSA says they are fine with it as long as the knives etc are not in/on them. So watch what's in the pockets!
It's OK, I've seen people arrive at the airport wearing them. Good motivation for fellow passengers to start conversations with you...
Could you not carry on your regulators and computers, etc. instead? Otherwise you may appear to be preparing for an in water crash landing...