A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,012
USAA has been working very well for me lately. Ameniti has had a couple of surprise hits in high-cost markets (e.g., 2-day rentals at Seattle where the cheapest possible rental at all was a Prestige car with the Ameniti code).
AAA, Costco, Entertainment, and all of the various airline CDP codes seem to yield about the same thing. Usually 10% off.