Hi all, always had the problem with either cart tanks or clearomizers flooding when I fly. I picked up a new Smok 3.5 Pyrex tank with the flanged cartos and not one gurgle/leak all day! I couldn't believe it, I flew all day at higher altitudes where the flooding occurs and no gurgling. I'm back to cart tanks again, not just for this reason but they're just just such a hassle free vape with much better flavor than clearos.