In addition to keeping your hands off of the more bacteria-ridden surfaces, you also want to keep your hands off of your face. Though you’ll do your best not to touch any of the dirtiest areas of the airport and your plane, it’s impossible to avoid touching anything at all. When you touch your face after touching these surfaces, you’re transferring all that bacteria to your pores. Wait until you’ve had the chance to wash your hands thoroughly before touching your skin.