Should people be allowed to fly when sick?

a few days ago me and my nana had a 10 hour flight back home, and during that flight there were two small children in the row in front that couldn’t stop coughing or sneezing, the littlest one was so ill that she screamed for most of the flight. then the asshole sat next to my nana kept coughing and sneezing and didn’t even bother covering his mouth and literally spluttered all over her. now both my nana and i have been so ill over Christmas, Christmas day was the worst, neither of us could move without feeling achy or in pain. now my 65 year old nana has just been admitted to hospital and is on oxygen, they’re testing her for the flu.
Should people be allowed to fly when sick?
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