Originally Posted by
emofeng
Thank you all for the comments. I will fly CNS-HKG-SFO! This will all be in J, but if HKG-SFO has F availability, I can use my AS miles to upgrade right? I'm using AS miles for the redemption.
I'm not sure I fully understand your question, but:
1) Only Cathay's Asia Miles can be used to upgrade an existing ticket, no other currency.
2) Award tickets of any type cannot be further upgraded with miles.
3) There are additional restrictions, but #1 and #2 should have you answered.