The United States recorded its 12th million COVID-19 case on Saturday, even as millions of Americans were expected to travel for the upcoming Thanksgiving holiday, ignoring warnings from health officials about furthering the spread of the infectious disease.

More than 1 million people flew through U.S. airports on Friday, according to data from the Transportation Security Administration, fueling fears of even greater spread of the virus. It was the second-heaviest domestic air traffic day since the start of the pandemic, despite pleas from health officials for Americans to stay home.