For the first time I've ever seen it, AC WebSavers (there's a misnomer if I've ever seen one!!

)offered YEG-YYZ-YEG with the return portions Monday and Tuesday with connections via YYC (i.e.. YYZ-YYC-YEG) in addition to YYZ-YEG non-stop.
I suspect insufficient passengers both in and out of YYC....