I'm doing ZRH-LHR-DUB-LHR-JFK-SEA-LHR-DUB-ZRH later this year. Mostly in J on BA, but the first two segments in Y, and the JFK-SEA booked on AA in F. I booked over the phone with BA to get the AA flight. It comes out to 670 TP. The return SEA-JFK leaves at 07.00, so I decided to skip that.