DL142, the early afternoon (the exact time shifts around a bit) SEA-AMS run, on which I have flown quite often over the past decade, is also notorious for being frequently delayed. I checked just now and it hasn't been too bad the past 10 days, but it had some a few very severe delays earlier this month (I was monitoring as I flew it on Oct. 12). It seems that for most destinations, Delta/ KLM will give you a choice between a dangerously short layover in AMS of an hour or less, or a crazy long one of 4-6 hours. After being burned a couple of times gambling on the shorter one (including instances where I made the connection but my checked baggage did not), I now routinely acquiesce to the longer layover. It seems odd to me that DL and KLM can't better coordinate their schedules to create Europe-bound layovers in AMS of about 2 to 2-1/2 hours, which seems about right.