Winter 2013/14 - American Services
Delta
JFK - B763 replaces B757 for the winter.
ATL - Mix of B764 and B763 for the winter, capacity increased but freq remains 5 weekly. The route is suspended between 12 Jan to 9 March. When it returns a B764 will be replaced by a B763 until 30 March when the A332 starts on the route just over two months ahead of this summer but a lot can change between now and then.
United
IAD - overall remains the same however the 4 weekly period in the new year is a few weeks less, the fifth weekly flight resumes late Feb.
American Airlines
JFK - 4 weekly B757 (new)
There is also the extra capacity form Aer Lingus which was posted earlier.