I flew on 4 different flights these past two weeks. I happen to take Southwest. On one of them when the flight attendant made the announcements he said, " It is very important to keep your mask on during the flight and between sips and bites. We must work togather to stay safe. If somebody around you is making you feel uncomfortable please notify a flight attendant right away".

Now he did not directly say to tell on your neighbor but that is what I heard.

On a lighter note.... I was not wearing a mask in any of the airports themselves SLC, PHX, SAT, or DEN and nobody said anything. Oh and I didn't catch Kung-Flu... SURPRISE! Lol