Is the whole flight showing sold out, or just the want to get away fares?? There is a big difference. I have not seen whole flights sold out within 24 hours of release ever, even for holiday weeks. WGA fares yes. But that does not mean the whole flight is full. Over the last few years I have see WGA fares listed as sold out & then come back weeks later several times. SW limits how many low fares they offer. They seem to be doing this more lately. They “sell out” of WGA fares on even mundane days. I have had it happen on my flights from Buffalo during at least 3 of our last 4 trips. None of them have been holiday weeks either. When our flights were sold out of WGA fares, so were the WGA fares in several cities. And weeks later, the WGA fares came back in all the cities I had previously checked all on the same day. And my rates were even lower than opening day rates that time.
So personally, I take the immediately sold out WGA rates as a ploy by SW to get people to book the higher rate classes. Again, I have never flown a holiday week before. I booked Easter week yesterday. Almost every flight showed sold out of WGA fares for our dates by yesterday afternoon. And there are a lot of flights. I am thoroughly convinced they will be back. Only question is when. And by the way, every flight has seats at the higher prices, none are truely sold out.