I have seen them show "Wanna Get Away" as sold out or unavailable right away. Then later on, they're available. I think what they do with some flights is make very little seats available initially, maybe hoping to get people to book the higher class fares. Then, as time goes on and not many people purchase the other, more expensive class of fares, they transfer the seats from those classes to the Wanna Get Away class and they suddenly show as available. Combined with them already reducing flights at many airports, it doesn't make for a good situation.