Moderator, Air Canada; FlyerTalk Evangelist
Join Date: Feb 2015
Location: YYC
Programs: AC SE MM, FB Plat, WS Plat, BA Silver, Marriott Plat, Hilton Gold, Accor Gold
Posts: 18,942
AC usually doesn't want to hold bags overnight at YYZ. A couple of people have posted here that they were able to do it, but I've been told on multiple occasions that it's not possible and had to pick up my luggage upon arrival and then re-check it in the morning. So I wouldn't get my hopes up.