12. Turning off the air-conditioning over your seat
During flights, airplanes tend to put their air conditioning systems unbearably low, making us feel like we’re in the Himalayas — but it’s that way for a reason. The low temperatures in the airplane keep bacteria from spreading all around and also prevent you from getting a cold or the flu. When you turn the air-conditioning off above your seat, bacteria find it easier to survive. This poses a danger to you and the people next to you by exposing them to airborne viruses that can no longer be sucked up by the air-conditioner above your seat.