I have been stressing over this since learning the policy after I bought the tickets......I had no idea prior, I obviously don't fly much......LOL
anyway, from what I hear if you check in online 24 hours prior you will most likely get an A boarding pass and should have no problems......the seats are 3 on each side of the aisle.
even with a B pass, some say you won't have trouble.
I called southwest and they were able to tell me if my flights were originating where I was getting on, in other words there won't already be people on the plane. which makes your chances better,
also if you have a child under 5 years old you will be able to board before the B group, if you do not get an A pass.
and also from what i understand you check in each person online so if you aren't quick enough I suppose one could end up with an A and one with a B, But the southwest representative said they would let the family board with the A person.......she said they do everything they can not to split families up.
my ds is 4 yo so if I don't get an A pass we will be able to board before the B group........we are a group of 4.......so hubby can take 1 kid and I can take 1 kid if we have to split. they actually may like that if they can each get a window seat........