Although the Seatac has a somewhat dated layout with two different trains needed to reach the N and S satellite terminals it is an relatively efficient and professionally run facility compared to most other US airports. For 20 years I was based in PHL and flew 8-12 times a year. For the last 15 years I have been based in SEA. The experience is like night and day. Fundamentally 80-85% of SEA flights run on time while the PHL figure is routinely around 70% and sometimes less. The fundamental requirement of an airport is to have the capacity to land and park arriving flights in a timely manner and similarly dispatch departing flights. There is plenty of data available to determine whether they are doing this and it should be given a heavy weight in any benchmarking/ranking system. There is a good choice of food in a clean and airy central food court with large picture windows and high ceilings. One of my favorites is Vino Volo where it is possible to taste a flight of wines accompanied by light snacks - and they will pack up gift packages for you to take on the plane. Very civilized. Two obvious weaknesses exist and they reflect poor planning. One is the location of the light rail station which is way too far from the terminal. The other is the location of the new car rental terminal which should have been connected to the light rail but has to be reached by a separate bus system. However this lack of co-ordination between different transit agencies is a chronic problem in Washington state.