Maybe not 'valid' per say but took advantage of a schedule change...

YUL-IST TK J 333
IST-CAI TK J 321 (36h stop)
CAI-DXB MS J 77W (5 day stop)
DXB-PEK CA J 333 (2 day stop)
PEK-SYD CA J 332 (10day stop) Rev ticket SYD-OOL for 4 days cost ~150AUD for 2 on VA
SYD-YVR AC J 77L
YVR-YEG AC J E90
YEG-YYZ AC J 320