Originally Posted by
yyzprincess
With the introduction of E-Credits, if AC 33 is not booked as a through flight you have to wait for the window to open for each segment.
Emphasis added.
Originally Posted by
Lllahim
Maybe I don't have to fight.
You need to read more carefully. Of course one would book YYZ-SYD as a through flight if one's going from YYZ to SYD. And of course an upgrade on that through flight should stand for the whole flight, i.e. from YYZ to SYD.