FILE - In this June 10, 2020 file photo, Transportation Security Administration agents process passengers at the south security checkpoint at Denver International Airport in Denver, as travelers deal with the effects of the new coronavirus. TSA, the government agency that oversees air travel, said the number of passengers screened for flights topped one million in a day on Sunday, Oct. 18 for the first time since the coronavirus pandemic outbreak last March. (AP Photo/David Zalubowski, File)
SILVER SPRING, Md. — The number of passengers screened in a single day for flights in the U.S. topped one million for the first time since COVID-19 infections began to spike last March.