Combining thoughts from various threads and posts...

AC has had it pretty good for quite a while, regarding competition.

Now Westjet is taking delivery of very very cheap 767's (20+ years old) at $8-12 million each, no doubt leased. This is while AC is taking delivery of brand new Dreamliners which biggest advantage is fuel consumption. With oil at such low prices, presumably for a while, I would imagine WJ has a substantial cost advantage over AC and ACr.

Westjet has announced a handful of LGW routes has stated it is looking at Asia.

With rouge limited to 50 planes, Westjet could begin eating in to AC's lunch.

Imagine if Westjet put on YVRSYD?!