Careful about SEA-AMS. DL's been calling this an A339 route for 2 years, but most of the time it's actually operated by an A333. This summer, both daily flights were originally scheduled as A339s, but other than a few random days, they were both flown by A333s. The size of the A339 fleet is growing, so maybe it will get better. But for now, I don't trust that route.