FYI.. I just flew halfway around the world without any problems. I went through security in Denver, Seattle, Tokyo, Bangkok, Calcutta, Delhi, Kathmandu, as well as two smaller regional airports in Thailand. I went through security a couple times in several places since you have extra screening when you switch concourses internationally. I took three 510s, a PCC and a new Janty eGo. I put the ecigs in the case I carry my battery cables, travel clock, etc. No one looked twice. I vaped in bathrooms at the airports, as well as in the airplane with no difficulties. I'm not brazen enough to do it publicly - I don't want the hassle. It does not set off the detectors in airplane bathrooms, but I blew the vapor towards the floor. Most of my meetings were in nonsmoking locations with nonsmokers. However, the 510 slips into a coat pocket nicely - and there were a few bathroom breaks to vape.
It is interesting that no one in the airports even questioned them through the xray machines. I had three bag searches - the toughest being the flight headed back to the US. They looked in the case I carried the adapters, etc., and didn't even hesitate. I did not separate the carts or atomizers.
The only place I got questioned was going into the Taj Mahal. They did a bag search and the guard questioned me about it. I tried to explain it was a nicotine inhaler to quit smoking, but he did not get it and asked me to take it apart. Since it was apart, I couldn't show him. He didn't understand what I was saying and kept asking if it was wireless.. finally I said.. "yes, wireless" and he waved me through. Go figure.
I took the liquid in small 5ml bottles that I had ordered as samples. They have a label on them, but I don't even think that is necessary. Many people put shampoos, etc., in plastic containers without labels. I put the liquids in the one quart bag with my toothpaste, hand cleanser, etc., and again, no questions at all.
I feel very comfortable traveling with the ecig stuff. I have flown a few times in the States as well, without issue. After I go through security, I can put them in my shirt or jacket pocket and use them in restrooms without an issue. I even went in to a smokers lounge once to use them. Got a few curious stares, and a heavy tobacco smell on my clothes. Gosh, I hate that smell on my clothes, so I didn't do that again. I haven't smoked since I started vaping and I can go longer before the "desire" hits, so this has been a good thing.
It's great in hotel rooms, as well. No more hassle of going outside. I like this option to smoking,don't you?