People who live gluten free can travel by air but — as is so often —- a few special preparations make things more comfortable. First of all, consult this article “What Can You Take Through Airport Security?“. Not much, actually, and very little gluten free food will be available in the secure area of the terminal ore on the plane.
My personal strategy is to bring a box of gluten free energy bars to consume before and during the flight. I don’t stop eating simply because I have consumed enough calories — very few people do — but I do control myself when my only alternative is to eat the same thing over and over and over.