Same thing happened when my wife was looking for an Explorer Sport. One dealership didn't want to honor X plan (and that is totally up to them), but then turn around and tell us they just sold one that day for $5k over MSRP like it's some magical unicorn.
Xplan would make the fees capped at $75.
Maybe I misread, but I though Flak said that even the MCA members received the discount. Luckily my brother is an EAA member. Glad I checked on this thread!