From the earnings call two days ago:

Scott Kirby:
"China is just completely different for United today than it was pre-pandemic. We used to fly, I think, roughly 10 flights a day to China, and I think those days are gone. The demand environment is just entirely different. We just recently resumed Los Angeles to Shanghai and we're bringing that up to daily, that will bring us to three daily flights. And I really don't anticipate based on the demand we're seeing a lot more than that anytime soon. It's just a completely different world. "