My experience is generally limited to 1 airport, but here goes:
- Location: PDX
- Class Reserved: Intermediate (Group C)
- Class Received: Intermediate SUV (Group F)
- Status: Preferred
I've rented probably 10 times or so from PDX with the same experience all times but 1, where I was upgraded to a Full Size (Group E). My rentals are generally for the weekend (pickup Friday, return Sunday or Monday), and the one exception occurred when I booked for a full week (during a holiday week as well).