I'm going to Europe next week, via LHR, and I had booked my trip a couple of months ago. Got a decent fare on a J ticket SEA-JFK-LHR, and used an SWU to upgrade to F on JFK-LHR leg. A couple of weeks ago, I log into AA and look at the trip, and I notice my seat assignment for SEA-JFK is missing (as is the plane assignment). I finally had time to call the CK desk yesterday morning, and I did some quick research and what do you know, but there is no more SEA-JFK flight. Fortunately, I was able to get another option through LAX with the 77w so I could stay in F.

I know JFK scheduling is in flux, but I would have thought AA would have notified me that my flight no longer existed. Odd fail of customer service, that I'm glad I was proactive about.