Southwest is one of the most financially stable of the airlines and has many positive things going for it. As of today, their Web site indicates that their November schedule and fares will be available for booking on June 23. Usually they open at about 10:00 a.m. Central, although there are reports that they opened earlier than that by a couple of hours the last time the extended their schedule.
One of the good things about SWA is that they don't change flight schedules once they open for booking. That's one benefit of not opening up for booking until closer to the actual travel dates. Another good thing is that they currently allow two checked bags per ticketed passenger at no additional charge.
The big thing that differentiates SWA from most other airlines as far as the traveling experience goes is that they do not assign seats. Once you board the plane, you can select whatever seat you want. Boarding order is assigned in three letter groups--A, B and C--and number 1-60 within each group. They board starting with A1, then go A2, A3, etc. Families with children under four can board between the A and B groups if they have a B or C boarding card.
Except for A1-A15, which are allotted to Business Select passengers who pay a higher fare, the numbers are given out in the order you check in. You can check in online starting 24 hours in advance of your scheduled flight time, which usually gets you an A boarding pass. In general, you won't have any difficulty finding any number of seats together if you have an A or B pass. Things get down to pairs and single seats the later you get in the process, however. People either love this system or hate it. I've always had good luck with it.