Recommendation, don’t use the Advantage car rental in Seattle. We waited 45 minutes to get through a line of 5 people. The facility itself looked like a converted used car dealership that hadn’t been cleaned in quite some time. The counter staff was snooty. However, the driver of the courtesy bus was very helpful, giving us directions to the freeway.
Used Alaska Airlines. The plane was full, but not overbooked. I confirmed the reservations and printed the boarding passes at home.
I brought only one carry-on bag and still managed to overpack by about half.