Thanks for your reply and confirmation. In answer to your question, yes I have been able to book all the segments as far as JFK in F:
IAD-DFW AA F (domestic)
DFW-NRT AA F
NRT-HKG JL F (the morning JL flight offers F on this route on my travel date)
HKG-MEL-HKG QF F (day flight to MEL, overnight flight on return both F)
HKG-LHR CX F
LHR-JFK AA F
For the transatlantic legs I am going to add, I will relook at the routes and either find AA routes with F or use BA to Canada. Then I need to call AA.
Thanks again!