According to what I read just now in Wikipedia, and in an announcement on Twitter ((which can easily be translated with google)), Turkish Airlines is starting a 4x / week service to Seattle, March 9 / 2022.
Although they do not yet have direct flights to India, all being snarled and delayed by the pandemic, they have planned direct flights from Seattle to Bangalore on AA, and year-round to Munich,
as the approaching service start for Vancouver. And they already have both Qatar and Emirates, for the better or not.
All this is perhaps normal, as the Seattle metro is now at 4 million, almost as big as Montreal.
But it's Seattle being the corporate and tech powerhouse it has become, and obviously a larger market.
The only domain that seems to belong to Vancouver is Australia / NZ, and that seems more tourist/family Y class than J class, though I understand J class represents a percentage of tickets sold. As for first class? Well, it's always a possibility... Hey, I'm rooting for my hometown, be sure, but as far as competition from Seattle, the heat seems on.
And as a final remark, on a tangent, I sincerely believe that tight, Canadian over-regulation plays a part.


Links below
twitter
https://twitter.com/HavaSosyalMedya/status/1461293804682629126
Wikipedia / Istanbul airport / check part 3: Airlines & Destinations, Turkish Airlines
https://en.wikipedia.org/wiki/Istanbul_Airport#cite_note-65
And a brief but comprehensive article by Glen Korstrom at BIV, dated, ((January 2020)) but still relevant, I think.
https://en.wikipedia.org/wiki/Istanbul_Airport#cite_note-65