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In this image taken from video, the engine of United Airlines Flight 328 is on fire after experiencing “a right-engine failure” shortly after takeoff from Denver International Airport, Saturday, Feb. 20, 2021, in Denver, Colo. (Chad Schnell via AP)

Microscopic examination supports early suspicions that wear and tear caused a fan blade to snap inside one engine of a United Airlines plane that made an emergency landing shortly after takeoff last month in Denver, federal safety investigators said Friday.

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Chicago’s travel order. (Credit: Chicago Department of Public Health)

Visitors to Chicago who have been fully vaccinated against COVID-19 do not have to quarantine for 10 days or record a negative test for COVID-19, the city’s top doctor said Tuesday.

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In this photo provided by the Broomfield Police Department on Twitter, debris is scattered in the front yard of a house at near 13th and Elmwood, Saturday, Feb. 20, 2021, in Broomfield, Colo. (Broomfield Police Department via AP)

Debris from a United Airlines plane fell onto Denver suburbs during an emergency landing Saturday after one of its engines suffered a catastrophic failure and rained pieces of the engine casing on a neighborhood where it narrowly missed a home. 

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(AP Illustration / Peter Hamlin)

The short answer: It depends on where you’re going. In an effort to limit the spread of new coronavirus variants, many countries are requiring incoming travelers to show a recent negative test.

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(WTTW News)

The two states and the territory join Hawaii as the only areas with fewer than 15 new COVID-19 cases per day, per 100,000 population, officials said.

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Could passengers on domestic flights soon be tested for COVID-19 before takeoff? Crain’s Chicago Business editor Ann Dwyer has details on that story and more business news.

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Chicago experienced its first major snowstorm of the season on Tuesday, Jan. 26, 2021. (WTTW News)

For the second time in a week, Chicago is digging out after a massive snowfall.

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In this Nov. 25, 2020, file photo, air travelers line up to go through a a security checkpoint at Salt Lake City International Airport in Salt Lake City. (AP Photo / Rick Bowmer, File)

Travelers on airplanes and public transportation like buses and subways will be required to wear face masks starting next week to curb the spread of COVID-19.

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Cars drive on cleared roads in Chicago on Tuesday, Jan. 26, 2021 after the season’s first big snowfall. The city is gearing up for another major storm on Saturday, Jan. 30. (WTTW News)

City officials sought to reassure Chicagoans on Saturday they were prepared for a major winter storm to hit the city, which could dump between 5 inches and 9 inches of heavy, wet snow through Sunday.

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President Joe Biden departs after attending mass at Holy Trinity Catholic Church, Sunday, Jan. 24, 2021, in the Georgetown neighborhood of Washington. (AP Photo / Patrick Semansky)

President Joe Biden on Monday reinstated COVID-19 travel restrictions on most non-U.S. travelers from Brazil, Ireland, the United Kingdom and 26 other European countries that allow travel across open borders. He also added South Africa to the list.

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President Joe Biden speaks about the coronavirus in the State Dinning Room of the White House, Thursday, Jan. 21, 2021, in Washington. (AP Photo / Alex Brandon)

The 10 orders signed by Biden are aimed at jump starting his national COVID-19 strategy to increase vaccinations and testing, lay the groundwork for reopening schools and businesses, and immediately increase the use of masks — including a requirement that Americans mask up for travel. 

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In this Saturday, Dec. 26, 2020 file photo, people walk with their luggage through a deserted check-in hall at the airport in Munich, Germany as Germany continues its second lockdown to avoid the further outspread of the coronavirus. (AP Photo / Matthias Schrader)

Anyone flying to the U.S. will soon need to show proof of a negative test for COVID-19, health officials announced Tuesday.

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(WTTW News)

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.

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(WTTW News)

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.

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In this Dec. 20, 2020, file photo, passengers queue for check-in at Gatwick Airport in West Sussex, England, south of London. (Gareth Fuller / PA via AP)

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.

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United Airlines passengers from Heathrow to five US destinations will have to show a negative test result. (Jason Alden/Bloomberg / Getty Images)

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.