Being from Australia I have never flown SWA but have a couple of flights booked for our trip in April May. Can you really change to a cheaper rate if it comes out? I always thought those prices are set in stone, or is this a SWA arrangement only??
I don't know whether it's just a SWA arrangement, but yes, you can change if a cheaper rate comes out, you simply receive SWA credit (ticketless travel funds). If you're changing to a DING fare, you have to cancel your original flight then go back and rebook with the credit your are given, at least that is what I was told by a SWA employee. If you rebook to a published reduced fare, one available on the SWA website, you can go to travel tools, change existing air, and then "change" to the same flight. Any extra credit can be used to book a flight no later than one year from the date actually paid for your airfare. For example, you book on March 1 for a flight in June. You change it and get a $100 credit. That credit, no matter how many times you book and cancel, must be used for a flight no later than March 1. I rebooked our airfare about 6 times because my dates changed, DING, ect. and credit was set to expire on March 26. Some I have used to book DH a flight (even though he was not on the original flights) and the rest I sold on Ebay as the credits are fully transferable.
Anyway, back to changing to a DING fare, what I do is open up two tabs on my browser. I go into DING, get everything entered except the ticketless travel funds number. Then, I go to the other tab and go into my travel tools on SWA and cancel the flight I'm on. Then I can within seconds get my same flight booked at a cheaper rate as soon as I enter in my ticketless travel fund number. I don't want to chance that flight getting booked in the about of time it takes me to cancel and then get all the info entered back in. Slim chance, but I guess it can happen.
So, even though it does seem like a little work, it is totally worth it. For the money I saved on our flights in Jan for DD and me, I was able to get DH a flight and sell the remainder for $38 on ebay (face value was $45). So, I lost a few dollars, but would have lost over $100.