LOL!
Perhaps
DUmmie SheltieLover doesn't fully understand the article (s)he posted. Let me use myself as an example. The masks I use most often (when required, not as a
Panic-Fashion statement) are homemade, of two layers of cotton fabric. They would not be accepted on the few
foreign carriers listed in the article, but would be acceptable on US carriers (and were, without comment, in airports and aboard planes during my recent multi-stop trip to KC). Pretty much all that US carriers decline to accept are things like bandannas, scarves, and neck gaiters (aka runners' buffs).