I don't know about your flights in particular, but usually flight from US to Europe in J is lie flat seat. But if you have a connection in Europe, the 2nd leg is NOT lie flat seat. For our last flight, it was not even a bigger seat. They just sit 2 people in 3 seats leaving the middle seat open calling the room "your space" to share. I am not a big person so the empty middle seat doesn't do anything for me. I do get a free meal though while the economy class in the back did not.