Interesting, but I see it differently. That it can be as cheap to fly from YEG to Sudbury [via YYZ] as to just YYZ? If not cheaper? I think you should check out UA and UAXpress to see why these lower fares are being offered in the midwest, because this is more an interlining matter and revenue split, than a pure AC pricing matter. I am sure lots of similar "inequities" will emerge when looking at such situations where two or more carriers are involved in fare construction. [Has Sudbury become a hidden city for Toronto now?]