I wish it would give me those nice AAA prices at HLE. I can only get them here at the airport. Although it was so low with that plus the new $10/day off coupon that I booked it at PIT anyway. Cut over $30 off the Budget rate I had booked a couple weeks ago, and now it's also for a larger car. I might not use it, but might as well have a booking in. What I'm really looking for is some kind of deal on SUV, in case it snows. I just tried a lowball Priceline bid for that, no go. Figured maybe if I get the SUV that will make it not snow for sure.
For me, though, the rate on Hertz.com with AAA CDP is about $18/day as of yesterday, and yes it went down to about $16/day on the AAA.com site, for F. So not quite so dramatic as $27 vs $16. This was for Dec 23-27 at PIT, which previously priced high.
EDIT: it looks like AAA.com basically gives the prepay rates, as it shows $16.xx as the prepay rate on Hertz.com, with the AAA CDP.