I guess what I don't get about all this is since both vaccinated and unvaccinated passengers can transmit the virus, why does this even matter anymore? The main reason I can think of is hospitalization capacity, but since vaccinated/boosted probability of this is (according to the CDC) so low, if you had a few unvaccinated on board, why does it matter, as long as you didn't have, say over 5-10% that "could" get sick enough to require hospitalization? This is the logic that drove Hawaii's Safe Travels program, and I completely got that since there was limited hospital space.
Full disclosure, we are all vaccinated/boosted, so the data shows we are pretty protected. It doesn't bother me to be around unvaccinated people. Am I missing something here? Seems to me, if you are unvaccinated, you are just creating your own risk calculus, though some (kids, those with medicine interaction conflicts, etc.) can't get it anyway...