An airline worker helps a holiday traveler check in at Ronald Reagan Washington National Airport in Arlington, Virginia, the United States, on Dec. 23, 2020. In its latest advisory, the U.S. Centers for Disease Control and Prevention (CDC) has urged the public to avoid travel and stay at home during Christmas holiday to curb the further spread of the COVID-19 virus. The recommendation came as the country continues to see increasing COVID-19 cases, deaths and hospitalizations. (Photo by Ting Shen/Xinhua)

Holiday travelers wearing face masks are seen at Ronald Reagan Washington National Airport in Arlington, Virginia, the United States, on Dec. 23, 2020. In its latest advisory, the U.S. Centers for Disease Control and Prevention (CDC) has urged the public to avoid travel and stay at home during Christmas holiday to curb the further spread of the COVID-19 virus. The recommendation came as the country continues to see increasing COVID-19 cases, deaths and hospitalizations. (Photo by Ting Shen/Xinhua)

Holiday travelers wearing face masks are seen at Ronald Reagan Washington National Airport in Arlington, Virginia, the United States, on Dec. 23, 2020. In its latest advisory, the U.S. Centers for Disease Control and Prevention (CDC) has urged the public to avoid travel and stay at home during Christmas holiday to curb the further spread of the COVID-19 virus. The recommendation came as the country continues to see increasing COVID-19 cases, deaths and hospitalizations. (Photo by Ting Shen/Xinhua)

A holiday traveler wearing a face mask walks at Ronald Reagan Washington National Airport in Arlington, Virginia, the United States, on Dec. 23, 2020. In its latest advisory, the U.S. Centers for Disease Control and Prevention (CDC) has urged the public to avoid travel and stay at home during Christmas holiday to curb the further spread of the COVID-19 virus. The recommendation came as the country continues to see increasing COVID-19 cases, deaths and hospitalizations. (Photo by Ting Shen/Xinhua)