The jetstream has been incredibly strong recently. In fact some of UALs 757 flights from Western Europe have been forced to stop for fuel enroute as flight times have been up to an hour longer with the headwinds. Just last week I operated a turn from Chicago to Winnipeg. The outbound flight ended up being 3.4 hours gate to gate, on the way back we had a 200 knot tailwind and ended up blocking in at 1.9 hours. That was on a flight of only 613 miles each way, so you can imagine the knock on effect to Trans Atlantic traffic.