FILE - In this Thursday, Feb. 18, 2021, file photo, travelers wear face coverings as they queue up at the north security checkpoint in the main terminal of Denver International Airport, in Denver. Major U.S. airlines say they will ask passengers on flights to the United States for information that public health officials could use for COVID-19 contact tracing. The trade group Airlines for America said Friday, Feb. 19, that the carriers will turn over the information to the Centers for Disease Control and Prevention. (AP Photo/David Zalubowski, File)