Senior and AP rates generally have regular cancelation and payment terms. Equivalent AAA rates are frequently prepaid, non-refundable and non changeable.They are often bookable with points - which is the odd thing. I think they are sort of holding the rooms for conventions and such and then release them shortly before. Its very odd, and Ive seen it quite a bit.
Ill have to check the senior rates - for the most part I've seen those the same as AAA. Thanks