BEIJING — China's civil aviation regulator on June 4 adjusted policies for international passenger flights, allowing more foreign carriers to resume flights to China on a once-a-week basis starting from June 8.

Foreign airlines that have been unable to operate flights to China over the past few months due to the novel coronavirus pandemic can choose a qualified Chinese city for entry starting from June 8, according to an online statement by the Civil Aviation Administration of China (CAAC).

Airlines can file their pre-flight plans for the period to Oct 24, 2020 to the CAAC, the statement said.

To contain the risks of imported COVID-19 cases, China reduced the number of international passenger flights in March, allowing each operating foreign airline to operate only one inbound route with no more than one flight a week.

Starting from June 8, the CAAC will also introduce a reward and suspension mechanism, with detailed policies for the carriers to increase or suspend flights.

If all inbound passengers of a flight test negative for novel coronavirus for three weeks in a row, the operating airline will be allowed to increase the number of flights to two per week.

If the number of passengers testing positive reaches five, the flight will be suspended for a week. The suspension will last four weeks if the number of passengers testing positive reaches 10, according to the statement.

The CAAC also said China may "modestly increase" flights from some qualified countries under the conditions of controllable risks and adequate receiving capacities.