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American said, "We have multiple layers of protection in place for those who fly with us, including required face covering, enhanced cleaning procedures, and pre-flight COVID-19 symptom checklist."

American's decision to sell all seats on its flights plays out against an uptick in coronavirus cases nationwide and a pullback in the pace of reopenings in major states, including Florida and Texas.

Amid furious worldwide criticism of Trump's decision on Thursday to quit the Paris climate agreement, White House spokesmen had refused on Friday to say whether the president even believed the climate was changing. He said frequently during last year's election campaign that climate change was a hoax.

Among the five new patients without recent travel histories, three were linked to bars in the Lan Kwai Fong nightlife hub.

Amid speculation that a major tariff war may not materialize, the Dow Jones industrial average fluctuated wildly on Wednesday, plunging 501 points after the opening bell but closing the day up 230 points at 24,263. The S&P 500 closed the day up 1.16 percent.