i work for the TSA *normally speaking* you can bring you PV in you carry on, if your a nice person you will take it out place it in a bin with other pocket items, so if the TSO wants a second look they just pull the bin out look down. Some TSO's are a little uneducated on PV's and would like to learn or make sure what your bringing is safe. Most airports (some being different) allow vaping inside, but please don't blow huge clouds of vape most people have poor vision and will think you are smoking and, well, you know what will happen after that. quart size baggie your liquid with all other various toiletries and you will enjoy a speedy screening provided the lines of course... also the FAA doesn't allow vaping on planes cause there is no ventilation on the plane and if you are vapping everyone is too including little 3 year old sally jobob or whatever. Vapor does dissipate but the particle float around the plane Vs. an conditioned building where stuff gets moved outside.