Y, B, H, and M domestically
plus K international
should be OK CP fares to upgrade
As Shareholder states, CP's Q, N, V and L are ineligible for upgrading.
I just book the AC codeshare number (hence you get AC fare codes) so I don't have to break my brain thinking about it. Not sure this works for flights to SYD and PEK though.
[This message has been edited by BlondeBomber (edited 09-11-2000).]