Seattle-Tacoma International

Fun fact which I only recently stumbled upon - Sea-Tac Airport has the world's second largest parking lot with around 13,000 spaces.  And since all the spaces are in a garage, it's also the largest parking garage in North America.  To be honest, I'm actually quite surprised that there aren't bigger parking lots in the US.  Despite the enormous number of spaces, I have never parked there since it is so inordinately expensive to do so.  It is much cheaper to use one of the nearby off-site parking lots, which is what I do.  Normally you don't have to wait long for a shuttle bus to take you to your car, but this was the second time in a row where I've had to wait a while for one to come.  Thankfully there is quite a wide choice of off-site parking lots, so it might be time to try another one.