The "Circuit Breaker" is a policy from CAAC. If any intl flight landed in China that generate 5 positive cases from the PCR test upon landing and the following 7 days since landing of the flight, the flight will not allowed to operate 2 times. If 10 positive cases are found, 4 flights are not allowed to operate.

Since Dec until about now, almost every flight into China have had confirmed cases upon landing, so adding up all the cancellations, there are only a handful of flights will be allowed to fly for the rest of Jan and Feb into China.

I was planning on fly into China late Feb with American, as of now, don't think AA will have any flights into China in Feb. . I am in the mix of rebooking now.

The CAAC official website publish info of curbed flights on a daily bases, but only in Chinese version. I have no luck of finding the same info on their English version of the site. I was planning on going to China late Feb for work and conferences in March, but now I have to delay my plan because there are almost no flights allowed to fly into China now in Feb. the only few lucky flights may still available are already booked out or at least showing 0s.