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Dr. Allison Arwady, the commissioner of the Department of Public Health, addresses the news media on Wednesday Jan. 19, 2021. (Chicago's Mayor's Office)

Chicago's COVID-19 test positivity peaked at 19.6% on Jan. 1, Arwady said, and hit 12.6% on Tuesday, the lowest rate since Dec. 28, according to city data. 

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A Dreamliner 787-10 arriving from Los Angeles pulls up to a gate at Newark Liberty International Airport in Newark, N.J., Monday, Jan. 7, 2019. (AP Photo / Seth Wenig, File)

The decision from the companies came Tuesday as the Biden administration intervened to broker tried to broker a settlement between the telecoms and airlines over a rollout of new 5G service.

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A passenger walks past a Southwest Airlines plane at Sky Harbor International Airport in Phoenix, March 26, 2021. (AP Photo / Sue Ogrocki, File)

The new high-speed 5G service uses a segment of the radio spectrum that is close to that used by altimeters, which are devices that measure the height of aircraft above the ground.

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(WTTW News)

“COVID is very real, it’s merciless, and unless you are fully vaccinated, your defenses against it are pretty low,” said Dr. Allison Arwady, the commissioner of the Chicago Department of Public Health. 

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To prevent the spread of COVID-19, air travelers wear masks at Love Field in Dallas, Friday, Dec. 31, 2021. Flight cancellations surged again on the last day of 2021, with airlines blaming it on crew shortages related to the spike in COVID-19 infections. (AP Photo / LM Otero)

Saturday’s disruptions weren’t just due to the virus, however. Wintry weather made Chicago — where forecasts called for 9 inches of snow — the worst place in the country for travelers. More than 800 flights were scrubbed at O’Hare Airport and more than 250 at Midway Airport.

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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.