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Hi Paul123... Before I catch a plane I usually add 3 or 4 drops of lugols iodine solution to a small capful of water and fill up a dropper. I simply squirt this into each nostril and suck it back gently into my throat. Doing this therefore coats the inside of the nostrils with iodine and also helps to coat the throat with iodine. The iodine also slowly vaporizes from these locations, and so this also protects you lungs against any germs on the plane.
To protect against electrostatc problems on the plane -- take at least 1000 mgs of Vitamin C(as Ascorbate) before you fly. This helps to counteract the bad effects from the build up of positive ions on the plane.