"Finnair said it plans to increase its flights to Shanghai from the current two weekly flights during the winter season to four times per week in the summer of 2025."

Wow, AY doubling China flights, amazing! Four times per week!

AY started service to China in 1988, to PEK. Probably less than four weeklies initially, but I would guess that we must be looking at the early 90s to find a schedule where AY has no more than 4 weeklies to China (excl. HKG).