Birds did it causing plagues in ancient times. Planes are doing it now. They both have wings,and that fits. Oooops I left out mosquitoes and they too have wings,and flies.Air travel can take an infected person from an epidemic country and land him or her in Chicago. We now know of embola from Africa. I think the worse infection is TB.It can easily infect,and take over a year before you know you came down with it. In that time you infected 100s Airplane spreading germs is one big GOP Mafia cover up That is a given TreBert