The US government said on Friday it would suspend 44 China-bound flights from the United States by four Chinese carriers in response to the Chinese government’s decision to suspend some US carrier flights over COVID-19 concerns.

The suspensions will begin on January 30 with Xiamen Airlines’ scheduled Los Angeles-to-Xiamen flight and run through March 29, the Transportation Department said.

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The decision will cut some flights by Xiamen, Air China , China Southern Airlines and China Eastern Airlines.

Since December 31, Chinese authorities have suspended 20 United Airlines, 10 American Airlines and 14 Delta Air Lines flights, after some passengers tested positive for COVID-19. As recently as Tuesday, the Transportation Department said the Chinese government had announced new US flight cancellations.

Liu Pengyu, a spokesman for the Chinese Embassy in Washington, said Friday the policy for international passenger flights entering China has “been applied equally to Chinese and foreign airlines in a fair, open and transparent way.”

He called the US move “very unreasonable,” and added, “we urge the US side to stop disrupting and restricting the normal passenger flights” by Chinese airlines.”

Airlines for America, a trade group representing the three US carriers affected by China’s move along with others, said it supported Washington’s action “to ensure the fair treatment of US airlines in the Chinese market.”

The Transportation Department said France and Germany have taken similar action against China’s COVID-19 actions. It said China’s suspension of the 44 flights “are adverse to the public interest and warrant proportionate remedial action.” It added that China’s “unilateral actions against the named US carriers are inconsistent” with a bilateral agreement.

China has also suspended numerous US flights by Chinese carriers after passengers later tested positive.

The department said it was prepared to revisit its action if China revised its “policies to bring about the necessary improved situation for US carriers.” It warned that if China cancels more flights, “we reserve the right to take additional action.”

China has all but shut its borders to travelers, cutting total international flights to just 200 a week, or two percent of pre-pandemic levels, the Civil Aviation Administration of China (CAAC) said in September.

The number of US flights being scrapped has surged since December, as infections caused by the highly contagious omicron variant of the coronavirus soared to record highs in the United States.

Beijing and Washington have sparred over air services since the start of the pandemic. In August, the US Transportation Department limited four flights from Chinese carriers to 40 percent passenger capacity for four weeks after Beijing imposed identical limits on four United Airlines flights.

Before the recent cancellations, three US airlines and four Chinese carriers were operating about 20 flights a week between the countries, well below the figure of more than 100 per week before the pandemic.

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