I agree with Ginevra's comments, below. I always carry an ample supply of the cards that she shows, attached. When I hand one of those cards to anyone, there is instant compassion and understanding, rather than frustration. I have not flown yet, since Covid, but I would make sure to have a supply and would hand them to every single person I come in contact with...to explain my situation in a simple, understandable way. I have had excellent results, asking people to just step back slightly and pull down their masks. Some people do it without even being asked, once they read my card. I can't say enough about how this has helped me survive these masked times with dignity and comfort.