FILE - In this Feb. 2, ,2021 file photo, a traveler walks through Terminal B of LaGuardia Airport in New York. U.S. airlines are pressing their case against requiring coronavirus testing of passengers on domestic flights. The CEOs of several major airlines met Friday, Feb. 12, with the White House's coronavirus-response coordinator to lobby against a testing requirement. They say it would further undermine air travel, which is still running at less than half its pre-pandemic level. (AP Photo/Frank Franklin II, File)

FILE - In this Dec. 22, 2020 file photo, people wait in line at a Delta Air Lines gate at San Francisco International Airport during the coronavirus pandemic in San Francisco. U.S. airlines are pressing their case against requiring coronavirus testing of passengers on domestic flights. The CEOs of several major airlines met Friday, Feb. 12, 2021 with the White House's coronavirus-response coordinator to lobby against a testing requirement. (AP Photo/Jeff Chiu, file)