A man greets his daughter at O'Hare International Airport in Chicago, the United States, on Nov. 25, 2020. U.S. Midwest state of Illinois reported 11,378 new COVID-19 cases and 155 new deaths on Wednesday, according to local public health officials. This is the second-highest daily death count the state has suffered in the second wave of the COVID-19 pandemic, the Chicago Sun-Times reported. (Photos: Xinhua)

Travelers wearing face masks are seen at O'Hare International Airport in Chicago, the United States, on Nov. 25, 2020.

Travelers are greeted at O'Hare International Airport in Chicago, the United States, on Nov. 25, 2020.

Travelers wearing face masks line up for security checks at O'Hare International Airport in Chicago, the United States, on Nov. 25, 2020.

Travelers wearing face masks are seen at O'Hare International Airport in Chicago, the United States, on Nov. 25, 2020.