The buckle on your seatbelt is also regularly subject to the hands of travellers. Heather Holmes, founder of P2 (a natural probiotic for deep cleaning) remembers constantly getting sick as a frequent flier. "When I flew every week, it was impossible for me to stay well, so I had sinus infections and the flu all of the time. What I didn't know is that I was contracting bacterial and viral infections from my tray table, seatbelt buckle, and the air the vent I touched." Her solution? If you can't avoid these areas, be sure to disinfect them right after you board the plane.