NOW BOARDING: WHY GERMS LIKE TO BE FREQUENT FLYERS
Although air ventilation systems refresh air every few minutes, passengers can cough germs into air that still make their way around the cabin before being filtered out. While airlines have improved filtration systems, the risk of catching infectious germs still remains.
Table trays can potentially have been touched dozens of times by a previously sick passenger.
The turnaround time for an airplane can sometimes be quick between flights. That means little time for a sufficiently sterilized cleaning.
Seats have headrests containing hairs, fibers and lingering germs that could be from a potentially sick passenger before you.