I am planning for a HKG trip in March but my schedule is very unsure at this point. However, since the seat sale ends today, i wanted to take advantage of the "on sale" V upgradable fare for my travelling companion while i will get a H class so I could do the ugrade for both of us while I book it.

My question is whether H class (HLXAPAC) is changeable, and if so, is it only for the inbound or outbound or both? Any charges?

I know that there is a 25% penalty for refund which is fine for me since there is a chance which I won't be going.