Originally Posted by
eponymous_coward
Your best bet for a three class F that doesn't incur too much tax or fuel surcharge would be an AA 77W flying their new 8 person F cabins to LHR. You can do this out of LAX or JFK. However, connecting to LAX from SEA is problematic, since AA does not fly the route and AS, which DOES fly the route as an AA partner, is not a US partner (and cannot be booked on a US award). So you will need to fly AA SEA-JFK.
If the goal is enjoy true F on a three-class international flight, I'd suggest that JFK-LHR is far too short a flight. LAX would be ideal, but it can be very hard to find F award space on AA.