25. Air-conditioning

In case you suffer from respiratory issues, you’ll be glad to know that the air in airplanes passes through the same system that’s used to filter air in hospitals. You can therefore rest easy knowing that you’ll be breathing very clean air as you fly.

However, this does not apply to the food tables. Those are filled with germs and well nothing can stop the person sitting next to you from becoming sick. Sadly, not everything can be perfect.