I hope someone can answer this question. I have a Southwest reservation for next Saturday 3/20 out of PVD to MCO (nonstop). My flight time is 5:30. In checking the Southwest site, I know that there are seats available on the 4:30 flight (also nonstop). What is Southwest's policy if I wanted to jump on the earlier flight? Would they try to charge me more (only the most expensive fare is available on the website)? I've flown with Southwest many times and have been on their website, but I can't seem to find anything about it.