 Never use the airplane seat pocket. They get stuffed with tissues, sick bags, dirty diapers, and more. And according to flight attendants, those pockets just get cleared out and never actually get cleaned. And you've probably used it to store your phone or laptop. In the middle seat, well that's the worst one. It's where parents usually sit their children, so next time you fly, if you have to use it, bring an antibacterial wipe to give it a good clean.