And if you've already booked flights with SW, check to see if the price has dropped. It only takes a couple of minutes to rebook the flights at the new rates, and bookings for even the least expensive category of seats ("wanna get away," I think), while not technically "refundable," do refund the difference as credit that can be used in the next year. (I rebooked our seats for a fall trip this morning, right after I got the SW email about the sale, and we got back $185 in credit.)