I fly all the time with vape gear. If you carry on your gear you should have little to no issues. Checked bags may be more problematic. I would wrap bottles in saran wrap and then put them in a ziplock. Carry tanks empty if checking. I never put my gear in the checked bag, juice maybe, but never my gear. Also if you are flying on a non American owned airline, you may be able to vape on the plane. I was able to use a cigalike type on South African Airways, Virgin Australia and Quantas w/o any complaints. Not sure if this is policy or I just got lucky.