If you and your friend get into a argument over something on the playground, instead of going to a teacher, you both agree to tell your stories to another friend you both agree will be impartial. You then both do what that friend says without involving the teacher.
If it’s assigned seating last is best. If it’s southwest… Being able to pick your seat sooner is better. (And maybe if you have a carry on and don’t want to be forced to checkout)