BEIJING — China's civil aviation regulator has announced that an Etihad Airways' Abu Dhabi-Shanghai flight, a China Eastern Airlines' Manila-Shanghai flight, and a SriLankan Airlines' Colombo-Shanghai flight, would be suspended after several passengers tested positive for COVID-19 on recent flights.

Six passengers tested positive on an Etihad Airways' EY862 flight on Aug 3, while there were six positive cases on a China Eastern Airlines' MU212 flight on Aug 5, and there were 23 positive cases on a SriLankan Airlines' UL866 flight on Aug 7, according to a statement posted on Aug 12 on the website of the Civil Aviation Administration of China (CAAC).

The decision was made on Aug 11.

The suspension of Etihad Airways and China Eastern Airlines' flights will last for one week, starting on Aug 17, while flights of SriLankan Airlines will be suspended for four weeks.

To further contain the spread of COVID-19, a reward and suspension mechanism was introduced by the CAAC on June 4.

According to the CAAC policy, if all inbound passengers on an airline test negative for the novel coronavirus for three weeks in a row, the operating airline will be allowed to increase its number of flights to two per week.

If the number of passengers testing positive reaches five, the airline's flights will be suspended for a week. The suspension will last for four weeks if the number of passengers testing positive reaches 10.

The CAAC also said that the airlines are not allowed to transfer the original quota for EY862, MU212, and UL866 to other routes.