Not sure which of the domestic airlines are most impacted by this but I didn't think UA was a "leader" in Asia (but could be totally wrong).
"In terms of passengers carried non-stop between [the US and Mainland China], Air China is the largest, followed by United, Hainan Airlines, Delta Air Lines, American Airlines, Xiamen Airlines and Sichuan Airlines, according to aviation analytics firm OAG." (from this article https://www.forbes.com/sites/tedreed.../#468d334f3ff9)
I could imagine when weighted by ticket cost, United would come out on top since United premium cabin seem consistently more expensive than Air China, but perhaps corporate contracts cancel that out...
My travel to China is impacted too, but didn't think I would make 1K again this year (let alone GS :P)