I don't know about other airlines, but CP always leave quite a bit of premium seats until last minute. If you do happen to buy a last minute full fare ticket, you will immediately jump to the top of the upgrade list within your level of elites. If you happen to be the top tier such as 1K or Exec. Plat, you will almost be guarantee a upgrade seat at the gate if there are any F or J seats left with your high tier and full fare ticket. No airlines is going to give away all their F or J seats for upgrade at the 72 hrs or 100 hrs mark, they ALWAYS leave some until the check in cutoff point.
Regards,
Empress
[This message has been edited by Empress (edited 12-02-1999).]