After reading all of this Southwest family boarding talk, I have another question. I have 2 kids, one is 3 and the other will be 6 is a couple of weeks. So, in just over a year, DD5 will not qualify for family boarding anymore. Normally, this won't be an issue. I will be able to board with younger daughter during family boarding, and DH can board with older daughter during regular boarding.
But, once she turns 7, what happens if I fly alone with both girls? Will the gate agents allow one adult and one over-6 child to board during family boarding, or does it have to be 2 adults? Or should I just choose a different airline if flying alone with a 4 and 7 year old where I can pick seats ahead of time?