Not all discounted F fares are issued in A class. Some are issued in F class.

"A" class is usually reserved for RTW fares. Yes, best is to ask your travel agent to check for discounted F class fares out of YVR. But that said, there usually aren't any discounts I know of which are Oneway to destination, and I see that you're not originating from YVR but rather from EWR! Why not do JFK-HKG?

But you may ask your TA to check with the local CX sales office - and also depending on how much clout your TA has to see what can be done...ie upg to F based on your full J ticket. BUT DON'T EXPECT anything...

I was on a full J ticket from YVR to HKG to BKK once and I'm Diamond, and because the flight was not full, CX in YVR won't even consider that!

Just our infor... what is the based fare you paid for your entire ticket? Then I'll know if you paid full fare or not... Is it around US$4300 one way?