I'd pack it - the less you have going through the security check point the better.
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If I pack an extension cord in my luggage will it go through the baggage check okay? I'm picturing them thinking it's a bomb or something. Or should I put it in my carry on bag?
Pack it in your checked luggage and be sure it's in excellent shape. Only use it in your cabin when you are there. When you're done recharging, unplug it and put it away. (Some Room Steward's on Carnival have been told to "confiscate" any extension cords, no matter what condition they're in .)
While I'm all for safety, I'm afraid they've gone "overboard" on this!
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