We mostly fly Southwest Airlines, where the crews have been very strict in their announcements that masks are required and shenanigans won't be tolerated. On our last two flights, though, the strictness disappeared. I suspect that's related to Southwest's CEO testifying before Congress that he thinks a federal mask mandate for travelers on planes, trains, and buses is no longer necessary. Of course, irony of ironies, the CEO tested positive for Coronavirus a day after giving that testimony to Congress— which he did in-person and unmasked!