How about AC
which dominates most airports in Canada (especially in the east), for the most part.
has the brand new 4-billion dollar terminal 1 all to itself (and its star alliance partners), big part of terminal 2 as well. Jetsgo, Canjet and all other airlines share terminal 3.
also accounts for most of YUL
's operations, Jetsgo can't give AC
a run for their money. Westjet does not seem to have much interest in YUL
With the rise of Westjet, AC
is loosing dominance over airports in the west (especially in YYC
), which is a good thing.