SH: I agree.
Let's take YWG-YYZ-YWG as an example.
This city pair is profitable for AC. On 14 FEB: There are 8 flights YWG-YYZ (Two are RJ flights and the other six are a mix of 320 and 319) The same frequency and aircraft are found on YYZ-YWG pairfor the same date.
WestJet flies the same city pair. On 14 Feb, they fly 4 fllights in both directions.
JetsGO for the same date has 3 flights in both directions.
In total, 15 flights a day between those city pairs.
Introducing American carriers on this city pair would only hurt the Canadian carriers. I don't think that there is much more growth left in traffic and the American carriers would only syphon away from the Canadian carriers.
There is already competition on this route and this keeps prices down.
Legacy American carriers still have high cost and I don't see them making much money on YWG-YYZ-YYZ