At the end of July, 2020 we flew with my son who has peanut and tree nut allergies and my daughter (no allergies) on Southwest Airlines from Fort Lauderdale through St. Louis to Omaha.
When purchasing thickets online, I selected that my son would need assistance and designated his allergies. We were allowed to pre-board on both legs to wipe down our row for past contamination. The gate agent in Fort Lauderdale said their policy is one person may pre-board with the passenger needing assistance, but the jetway agent actually allowed the three of us to board together, as my daughter is only 10 and I wasn’t going to leave her at the door alone. On that leg, they didn’t make an announcement, but from St. Louis to Omaha they did and asked passengers to refrain from eating nuts.
Their prepackaged snacks carry a label warning about nuts, but do not actually contain nuts. We declined our snack. People were wearing masks unless eating or drinking, but some people’s interpretations of “mask” are pretty loose. Saw a few silk scarves and some neck gaiters but everyone was covered up for the most part.