Yes, you can book through
AAA. You can book a room only reservation with a AAA discount yourself direct through Disney. If you want to book a package (room plus tickets or tickets and dining) with a AAA discount, then you must book through a AAA agent. If you do that, you must go through the AAA agent anytime you wish to check on new discounts that might be offered. I'm not sure what the discounts are anymore. It used to vary according to the level of resort with a higher percent discount on the deluxes and the least amount of discount on the values. I don't know if that's still the case. I originally booked my trip coming up as a room only direct with WDW using the AAA discount. I believe it was 15%, but it could have been just 10%. I just can't remember now. I switched over when the Spring general public discounts became available and saved a little more. AAA will give you the WDW confirmation number. You can use that to link your resort reservation to
MDE and book your dining reservations and fastpasses.