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China's civil aviation regulator said on Thursday that flights to and from some eligible countries can be increased moderately, under the premise of controllable risk and adequate receiving capability.

Domestic and overseas airlines that have been operating international passenger flights under restrictions imposed on March 29 will still stick to the previous plan, with domestic airlines flying one flight a week on one route to any country and foreign airlines operating one flight a week to China, the Civil Aviation Administration of China said.

Foreign airlines with no international passenger flights to the country will be allowed to operate one flight per week starting June 8, it added.

The administration will also have a reward and circuit breaker mechanism in place to contain the number of imported cases of the novel coronavirus.

If the number of passengers who have a positive nucleic acid test stands at zero for three consecutive weeks on the same route, airlines will be allowed to add one additional flight per week on the route as a bonus, it said.

But the airline will suspend the operation of the route for one week if five or more passengers test positive for the coronavirus. If the number exceeds 10, the airline will suspend flights on the route for four weeks, it said, adding that it could resume operation after the "circuit breaker" period.

The administration also noted that it will allow certain eligible countries to increase the number of international passenger flights in and out of the country if the epidemic risks are controllable.