I personally don't believe the masks do much good, if any, simply because us "normal folk" don't really know how/care how to use them properly. But then I think about my mother, who is 73 years old and a cancer survivor. When I picture her wearing her mask at the grocery (the only place she goes these days), I picture the other people around her also wearing masks. And, for whatever reason, I'm grateful. I'm no doctor, and I have no gauge on the efficacy of masks, really. But I will wear mine in an airport and on the airplane, as best I know how. Because someone else's high-risk family member just might be sitting near me. (I will also take a covid test prior to flying, although those have their own set of flaws.) As for SAS, I just think they need to bring back the alcohol so that people can chill out a bit more with the mask requirements. ;-)