I flew LGA-ATL for essential travel. The experience differed slight from my previous southwest flights since this flight is longer with a 2-hour duration.
Modified service on board includes:
Water cup with ice (no other options)
Snack (snack mix)
Blocked middle seats
Masks required for entire flight unless eating or drinking.
Modified boarding procedures:
Board 10 at a time by boarding number
Pre boards go first
Spaced out line up area for numbered boarding positions
Multiple announcements about required masks