American Airlines announced Tuesday that it is suspending flights to mainland China and Hong Kong until April amid the novel coronavirus outbreak that has infected more than 40,000 people worldwide.

The airline offers flights to Shanghai and Beijing in mainland China from its Dallas-Fort Worth and Los Angeles hubs. Those flights will be unavailable through April 24, according to a Tuesday statement.

American Airlines flights between the Texas hub and Hong Kong will be suspended through April 23. Flights between Los Angeles and Hong Kong will be suspended through April 24.

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American Airlines said in its Tuesday statement that it was authorizing the action “due to the reduction in demand” for flights to mainland China and Hong Kong.

The airline had previously announced that flights would be suspended until March 27.

The global director of the World Health Organization said the novel coronavirus presents a “very grave threat for the rest of the world” after the death toll in China due to the virus spiked to over 1,000 people.

"With 99 percent of cases in China, this remains very much an emergency for that country, but one that holds a very grave threat for the rest of the world," WHO Director-General Tedros Adhanom Ghebreyesus told reporters at a press conference Tuesday in Geneva, Switzerland.

"It’s a test of political solidarity — whether the world can come together to fight a common enemy that does not respect borders or ideologies," he added. "It’s a test of financial solidarity — whether the world will invest now in fighting this outbreak, or pay more later to deal with its consequences."

Federal health officials in the United States confirmed another coronavirus case in the country Tuesday, bringing the total number of confirmed infections to 13.