Mainland Chinese airlines have not made a significant return to North America post covid. Many reasons for this, not the least of which are the poor relations that still exist between Canada/US and China. I recall not many years ago a business class fare from Vancouver to Bangkok was $2400-$3000 on China Southern or China Eastern. Now the cheapest fare starts at $6000 on China Airlines/EVA (Taiwan), if you can get that. It really is competition that drives fares down. That doesn't exist right now from North America across the pacific.