FWIW, I only saw a single X3 and X4 at SEA last Thursday (entire lot was full, but there were a lot more cars in the return aisle which i didn't take note of) and zero Q5s (On this note, BMWs were few and far between that day). However, it did seem like Sixt had just recently taken delivery of a lot of those AMG GLC 43s (they had like 6 of them and the gate agent did offer me one of less than 1700 miles on it) so you might get one of those. There were also a couple of Volvo XC60s scattered throughout the lot.