To those of you still looking for flights, I wanted to quickly share my recent cash purchase experience:
I don't book flights on opening day because most of the time I don't know my wdw dates yet AND for my airport, DSM (Des Moines), opening day flight prices are good but not usually the best they'll ever be. So my way of checking for flights is to leave a tab open on my laptop and on my phone with my month and route pulled up and just refresh that through the day (my phone in the morning and at night while I'm in bed and on my laptop throughout the day). I'll check it probably at least 10x/day if not more, especially Monday-Wednesday. Anyway, on January 3 I found a great price for dates that would work for us and booked the flights. My only concern was that our flight down was going to be on a Sunday night and it would mean getting to our resort around midnight. I really didn't like that, but the morning flights at the time were just too expensive. So I booked the flight but kept checking just in case I would get to switch that night flight. Last night, at about 8:20 central time, a Saturday morning flight finally dropped to $129 (I had paid $120 for our Sunday night flight). I double-checked to make sure I could get that price for all 7 of us and once I determined I could, I started talking to our group to make sure everyone was okay with switching to Saturday morning. In less than an hour I had the go-ahead from everyone and was able to make the switch.
I went into our Sunday night flight reservation through my SW account and clicked on "change flight", then I selected the Saturday morning one I wanted, added my credit card information since I was going to owe about $60 for the switch, and confirmed the change. Because I did a "change flight", my Earlybird Check-in purchase switched to our new flights just fine.
So keep hunting! Flight prices can change at any time. I'm going to continue to check though, because the flight I switched us to on Saturday morning has 2 stops (only one plane change), and I'd rather take the other flight with only 1 stop. Otherwise, we're all set! And, as for now, we should arrive at our resort at about 6:00 pm -- so much better than midnight!