It is hard to beat SW's generous change policy....MUCH better than any of the legacy carriers....never a change fee.
I had a fairly small credit with Delta last year from a flight that went down in price (they assessed the change fee and I think I still had about $30 left over that they gave me a credit for)...but when I went to use the credit they told me I could not use it for fares booked on line....and of course the cheapest fares were only available on line....so it wound up going to waste (because the price diff in the on line cheapo fare and the fare available over the phone was more than the $30 credit)... not sure if that is the way it works at this point, but it was a pain in the neck at the time.
Conversely on SW I had tickets for the 4 of us from SDF to MCO for our trip in November that had been about $120/pp RT....last week I saw the great DING (thanks again Madge!!) and was able to rebook them at less than $90 pp/RT....it left me with about $130 credit in ticketless travel funds, however since I had paid for the original tickets with ticketless travel funds that expired 12/22/05 my $130 credit would expire then also. I do not have another trip planned to anyplace SW flies before then so I called their customer service and they will extend the TT funds for 6 months, no problem and she even suggested I wait and call back closer to their expiration date...since the 6 month extension begins at the time I request it, not when the funds expire....she said if I could not use the funds before they expire after the extension (no problem there actually!!) I can always request travel vouchers for the funds...not nearly as easy to use as TT funds, but still useful.
What a difference in attitude....I don't even mind the SW "cattle call" anymore...if we don't sit next to each other for 2 hours on the plane who cares??? (although in the last 20+ trips we have flown on SW that has only happened once) My kids are teens and suffer no emotional trauma if they cannot sit beside their mommy and daddy for a couple of hours, and although I really enjoy DH's company, 2 hours in seperate rows does not qualify as a life tragedy anymore!! (and yes, I would and have given my seat to families with younger kids that really do need to sit together...partly because I see the look of panic in the mom's eyes and partly because i would MUCH rather you sat next to your 3 year old for 2 hours than me!!)