I have flown in country many times and out of country twice with my ecigs and juice. What I always do is have one thing of juice in with my carry on (in the clear quart size baggie that you have to carry shampoo, lotions and liquids in) and 2 ecigs in my purse along with a charger in my carry on. (In case they lose your bags - you still have what you need) then in your regular luggage there is no problem at all - I put in another charger and 2 batteries and more juice.)
Most airlines don't let you vape on the plane, however, (since I am a nervous flyer lol) I take an ecig with me to the bathroom and have a few soothing puffs in there. I actually saw an ecig user on a recent flight who was discreetly vaping - he held the vapor in his mouth so that there was very little exhaled and he kind of looked down when he did it.
Good luck and have a fun trip!