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Travelers queue up at the Southwest Airlines curbside check-in area at Denver International Airport Sunday, Dec. 26, 2021, in Denver. Airlines canceled hundreds of flights Sunday, citing staffing problems tied to COVID-19 to extend the nation's travel problems beyond Christmas. (AP Photo/David Zalubowski)

Flight cancellations that disrupted holiday travel stretched into Monday, with major U.S. airlines each canceling dozens of flights.

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Travelers walk through Terminal A at Orlando International Airport on Christmas Day, Saturday, Dec. 25, 2021. (Stephen M. Dowell / Orlando Sentinel via AP)

More than 700 flights entering, leaving or flying within the U.S. were called off, according to the flight-tracking website FlightAware. That figure was down from nearly 1,000 on Saturday. More than 50 flights were already canceled for Monday.

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(WTTW News)

Chicago's updated travel advisory includes 42 states, announced Dr. Allison Arwady, the commissioner of the Chicago Department of Public Health.

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(WTTW News)

Even as the threat posed by the omicron variant of COVID-19 has yet to materialize in Chicago, the city is enduring a “very significant” surge of COVID-19 fueled by the holiday gatherings and indoor events, Chicago’s top doctor said Tuesday.

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(Photo by Marco López on Unsplash)

The rise in air travel is coming back down, thanks to the omicron variant’s rapid spread. Ann Dwyer has details on that story and more.

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(WTTW News)

Chicago's updated travel advisory includes 38 states, announced Dr. Allison Arwady, the commissioner of the Chicago Department of Public Health.

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 People queue to get on the Air France flight to Paris at OR Tambo's airport in Johannesburg, South Africa, Nov. 26, 2021. (AP Photo / Jerome Delay, File)

Amid fears that the recently identified new variant has the potential to be more resistant to the protection offered by vaccines, there are growing concerns that the pandemic and associated lockdown restrictions will persist for far longer than hoped.

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(WTTW News)

Of the 53.4 million Americans planning to visit family and friends or enjoy a mini-vacation, 90% will be hitting the road in cars. For those looking to avoid the worst of the traffic, AAA has identified a few windows of opportunity.

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(AP Illustration / Peter Hamlin)

It depends. It can be safe if you’re fully vaccinated against COVID-19, but officials say people who haven’t gotten the shots should delay travel.

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(WTTW News)

One week after it was removed from the advisory, officials returned Arkansas to the list of states with high rates of transmission. The advisory includes 38 states as well as Guam, announced Dr. Allison Arwady, the commissioner of the Chicago Department of Public Health.

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(WTTW News)

Chicago officials removed Arkansas from the city’s COVID-19 travel advisory Tuesday even as confirmed cases of COVID-19 continue to rise in Chicago as colder weather blanketed the city. 

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(WTTW News)

The advisory continues to cover 41 states as well as Guam, announced Dr. Allison Arwady, the commissioner of the Chicago Department of Public Health. 

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In this photo provided by Kimberly Fossen people work at the scene of an Amtrak train derailment on Saturday, Sept. 25, 2021, in north-central Montana. (Kimberly Fossen via AP)

NTSB spokesman Keith Holloway said Tuesday it was “still very early” in the investigation and the agency typically takes one to two years to determine accident causes.

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(WTTW News)

City officials removed Georgia, Louisiana, Maryland and Mississippi from the travel order, joining Florida, Hawaii, California, Connecticut, Washington, D.C. and Puerto Rico.

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Travelers wear face coverings in the line for the south security checkpoint in the main terminal of Denver International Airport on Aug. 24, 2021, in Denver. (AP Photo / David Zalubowski)

Beginning Nov. 8, foreign, non-immigrant adults traveling to the United States will need to be fully vaccinated, with only limited exceptions, and all travelers will need to be tested for the virus before boarding a plane to the U.S. 

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Travelers well up as agents confer at the United Airlines ticketing counter in Denver International Airport Friday, July 2, 2021, in Denver. (AP Photo / David Zalubowski, File)

United Airlines reported a $473 million profit for the third quarter thanks to more than $1 billion in federal pandemic aid that helped pay airline employees this summer.