U.S. airlines canceled hundreds of flights on Christmas Eve amid a surge in COVID-19 infections driven by the Omicron variant, but millions of wary Americans carried on with travel plans through a second pandemic-clouded winter holiday.

United Airlines and Delta Air Lines canceled hundreds of Christmas Eve flights, as the spreading COVID-19 Omicron variant takes a toll on its flight crews and other workers.

Packed intercontinental flights touched down and people embraced relatives at land borders on November 8 after the United States lifted restrictions imposed on travelers from much of the world when the Covid-19 pandemic began.

The U.S. Centers for Disease Control and Prevention (CDC) eased travel recommendations for more than 110 countries and territories, including Japan just ahead of the Olympics.

The U.S. Centers for Disease Control and Prevention (CDC) said on May 7 that U.S.-bound international air travelers can meet Covid-19 entry requirements using certain self-administered tests.

U.S. President Joe Biden on May 3 imposed new travel restrictions on India in light of the Covid-19 epidemic, barring most non-U.S. citizens from entering the United States.

The Biden administration said on April 30 it is extending face mask requirements across all U.S. transportation networks through Sept. 13 to address the spread of Covid-19.

The U.S. State Department will boost its “Do Not Travel” guidance to about 80 percent of countries worldwide, citing “unprecedented risk to travelers” from the Covid-19 pandemic.

The U.S. Centers for Disease Control and Prevention on April 2 said fully vaccinated people can safely travel at “low risk” after the agency had held off for weeks on revising guidance that discouraged all non-essential trips.

Reuters found new evidence that the U.S. Centers for Disease Control and Prevention’s (CDC) response to the pandemic was marred by actions – or inaction – by the agency’s career scientists and frontline staff.