Flights between the U.S. and China have been severely limited since the start of the pandemic. Even as China re-opened, they’ve limited flights by U.S. airlines, and the U.S. government has limited flights here by Chinese airlines. Neither side’s decisions are supported by the bilateral agreement between the U.S. and China.
With limits on flying between the two countries slowly being lifted, United has filed to operate more flights. One of those is San Francisco to Chengdu. They’ve filed to fly to an airport there that no longer accepts international flights.