Under the new system, which will take effect Friday, a state will be placed in one of two categories — orange or yellow — based on whether it has more than 15 new COVID-19 cases per day, per 100,000 population, officials said.

Travelers from the Badger State can avoid the 10-day quarantine if they record a negative test for COVID-19 within 72 hours, according to the city’s COVID-19 travel order.

The U.S. is the latest country to announce new travel restrictions because of a new variant of the coronavirus that is spreading in Britain and elsewhere.

United Airlines on Thursday became the fourth major airline with routes between London and the New York metropolitan area to require passengers show proof they have been tested negative recently for the novel coronavirus.

Despite warnings from public health experts to stay home, over 1.19 million travelers passed through U.S. airport security checkpoints Wednesday — the highest one-day total since the crisis took hold in mid-March.

Millions of Americans are traveling ahead of Christmas and New Year’s, despite pleas from public health experts that they stay home to avoid fueling the raging coronavirus pandemic that has killed more than 320,000 nationwide.

Travelers coming to Chicago from nearly every U.S. state, plus Puerto Rico and the District of Columbia, must quarantine for 10 days or record a negative test for COVID-19, Mayor Lori Lightfoot’s office announced Tuesday.

Across the country, contact tracers and emergency room doctors are hearing repeatedly from new coronavirus patients that they socialized over Thanksgiving with people outside their households.

The airline industry has been devastated by the coronavirus pandemic, but with vaccines seemingly on the brink of approval, airlines are hopeful that 2021 could see the beginnings of a recovery for air travel.

The nation’s unwillingness to tamp down on travel offered a warning in advance of Christmas and New Year’s as virus deaths and hospitalizations hit new highs a week after Thanksgiving.

The Centers for Disease Control and Prevention and state and local authorities have begged people not to travel and urged them to keep their Thanksgiving celebrations small.

Typically, Thanksgiving is deemed the beginning of the celebratory holiday season. But this year will be different amid the worsening COVID-19 pandemic. Will Mother Nature cooperate with your plans?

With the coronavirus surging out of control, the nation’s top public health agency pleaded with Americans on Thursday not to travel for Thanksgiving and not to spend the holiday with people from outside their household.

The delays are happening as the country braces for winter weather, flu season and holiday travel, all of which are expected to amplify a U.S. outbreak that has already swelled past 11.5 million cases and 250,000 deaths.

Chicagoans should not travel to celebrate Thanksgiving with friends and family, the city’s top doctor said Tuesday, warning that the second wave of the coronavirus pandemic is getting worse in Chicago.

United Airlines will conduct free, rapid COVID-19 tests on passengers and crew members on select flights between London and New York. Crain’s Chicago Business Editor Ann Dwyer has details.