Final tip: when booking on Southwest, I recommend booking each person's trips individually, as one way flights. It does not cost any more to do it this way, and it really doesn't take that much more time to do. However, when it comes to making changes later, it makes it much easier. Simple one ways with one person on them can be easily changed online. More complex reservations require you to call in, wait on hold, explain what you want to do to the agent, risk the fare you want disappearing, etc.