O/D JFK-HKG availability in F is very limited. It's often better to a point beyond, like KUL or PEK, if you can possibly add another city to your trip. If you can find a o/w to HKG in F, and a return in Y, you may want to book it, because there's a good chance an F or J seat will open up close in. AA allows you to upgrade a booking with the same O and D if space opens up without a fee, so its a chance you may want to take.