The government will continue to restrict departures and arrivals of direct flights connecting Japan with mainland China to four airports -- Narita, Haneda, Kansai and Chubu.While all airports in the country will become open to direct flights from Hong Kong and Macau due to a reduction in coronavirus cases in the two cities, airline operators have been requested not to increase the number of flights.On Sunday, the new measures for travelers from mainland China were put into practice at Narita airport near Tokyo, as 150 passengers of a flight from Shanghai arrived at the airport in the afternoon and submitted saliva samples for the high-sensitivity antigen test.China on Sunday reopened borders and abandoned quarantine measures, fully departing from its strict "zero-COVID" policy that involved lockdowns and isolation measures at designated facilities.Japan greatly relaxed its border restrictions in October, allowing travelers to skip COVID-19 testing upon arrival provided they show proof of having undergone at least three vaccinations or a negative COVID test within 72 hours of departure."