AA MILES UPDATE:
This had not been pointed out previously - the availability issues we're seeing in late July and beyond on AAvacations appears to be strictly tied to rental car availability. Thanks
@snugglebug for bringing this to the forefront. (They hadn't actually "gone away" - availability had always remained for 2019, we just weren't seeing any availability for 2020 until last week).
So it's important to point out now that AA does have access to Disney resorts throughout all of 2020 (I can see availability on UseAAmiles for December 2020 even). The problem is
you don't want to book on UseAAmiles. AAvacations pricing (in most situations) will save you a substantial amount of miles and you'll want an opportunity to compare the two. So if you're looking at dates of late July 2020 or beyond and cannot yet see availability on AAvacations, the best course of action is to wait.
Good luck all, I'm very glad that Disney Resorts have made a triumphant return to the AA portal. A major question we still have outstanding is:
Will Disney Discounts track into the AA portal for 2020? We should know the answer to that within a month or so. IF they do, that's a major win. If they don't it will affect the cpp return on those miles and that would be unfortunate (and can be so dramatic a difference that booking direct could win out). Lots to consider!
EDIT: If you're wondering where UseAAmiles
could make sense - an example scenario would be at a moderate resort with a short stay or deluxe with an extremely short stay. Typically a longer stay of any sort and most deluxe stays are going to win out on AAvacations due to the mileage structure. Of course it's always best to compare BOTH! (You can see an example below from my post earlier this week of how I compared every option out there before booking to make sure I was making the best decision possible).