Turn On the Overhead AC
We know, it can get excessively chilly inside airplane cabins. Naturally, you would want to shut the air conditioner vent to keep cold air from turning you into one huge in-flight ice cube, bacteria and all. However, don’t do this. Never, ever shut the AC off.
This might seem silly, but the blast of air coming in your direction can shield you from the germs of other passengers. The gusts of wind can blow their germs right back at them, so you don’t have to catch whatever disease they’re suffering from. If you’re feeling a bit chilly, just put on more layers of clothing.