Quick follow up...I was going to roll the dice on our reservation this weekend but our 6 month old son has an ear infection and the doctor strongly advised us not to fly. Looked at rebooking in several weeks but the non-discounted rate is many times higher which, strangely, makes me more hesitant to use the AWD. I instead went with Hertz where I can legit use a USAA discount and it was only ~$45 more than I would've spent at Avis.