CO is restarting its YEG-IAH daily service sometime soon too. Pretty much simultaneously, YEG is losing its SLC service on DL.
That's pretty significant as DL and before it WESTERN had served YEG via SLC for decades. Is this the end of DL in YEG?
As for CO and Canada, other than Texas/Alberta links, not much demand for other routes until the economy returns down south. Canadians may be traveling but Americans are not, making it hard on US carriers to serve this country.