Reported on another forum:
Air Canada have been loaded back into Chroma Fusion (MAN airlines management/arrivals systems)
AC840 arrives 08:05 daily with B767-300
AC841 departs 09:35 daily with B767-300
Will be good if these guys come back, as airlines on the YYZ route seem to have diminished back to a managable level again (basically just TS this year compared to TCX/TS/Flyglobespan when AC pulled out)