https://chinatravelnews.com/article/171420
(also on Bloomberg, but this link isn't behind a paywall)
"United Airlines Holdings Inc. has delayed plans to add extra US-China flights by at least six months, according to a person with knowledge of the matter, as the two nations remain deadlocked over lifting Covid flight caps. The increase in flights was originally slated to start late next month, but the move was postponed over the weekend, said the person, who isn’t authorized to speak because the matter is private. The airline has started to inform affected passengers, they added."