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It's very easy to cite safety rules as flying with the flu or any communicable disease is already considered a no go condition.
Why can't you see the difference here - IF YOU ARE VACCINATED YOU MAY STILL GET THE FLU OR COVID. Your statement above - if you have flu or any communicable disease is already considered a no go condition - SO DOES THAT MEAN I HAVE TO SHOW YOU A FLU VACCINATION PROOF BEFORE I GET ON YOUR PLANE? Are you getting it yet?