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Airlines’ middle seats cited as Covid risk, with caveats

Just how risky it is to travel during the pandemic?
Image: Jasper Juinen/Bloomberg

The risk of being exposed to the Covid-19 virus on an airline flight drops by as much as half when airlines keep middle seats open, a new study published by the US government concludes, a safety practice the carriers have abandoned.

The study is the latest to roil the waters on a controversial topic: just how risky it is to travel during the pandemic. It did not attempt to estimate infection risks and was based on modeling done before the pandemic, so didn’t consider rules that now require face masks on flights.

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The risk of coming in contact with the virus dropped by 23% to 57% if airlines limited passenger loads on both single-aisle and widebody jets, compared to full occupancy, according to research released by the Centers for Disease Control and Prevention on Wednesday.

“Based on a data-driven model, approaches to physical distancing, including keeping middle seats vacant, could reduce exposure to SARS-CoV-2 on aircraft,” the study said.

While airlines have touted research — sometimes funded by the industry — showing low risks from the novel coronavirus during travel, there have been studies showing transmission can occur on flights even when passengers were wearing masks.

For the CDC study released Wednesday, scientists at the agency and Kansas State University, a leading center for study of airline cabin air quality, used multiple models to predict how airborne virus particles would spread on planes. The models were based on a surrogate virus and data from a 2017 study.

The study’s results may be too late for US travelers.

Delta Air Lines will resume selling middle seats on May 1, the last US carrier to lift a social-distancing policy that has been in place more than a year. The carrier temporarily reopened the seats on some planes April 4 and 5 after a staffing shortage forced it to cancel about 100 flights.

Delta decided to end the policy amid rising evidence of a long-expected resurgence in travel demand as US vaccinations increase and consumers book flights to visit family or take a vacation.

The decision was based in part on “the knowledge that nearly 65% of those who flew Delta in 2019 anticipate having at least one dose of the Covid-19 vaccine by May 1,” Delta Chief Executive Officer Ed Bastian said in announcing the decision March 31. The carrier earlier said it was “safe to sit in the middle seat,” but opted to keep the ban in place to assuage any potential passenger anxiety.

Some carriers never limited seating as a result of the pandemic and others lifted the practice months ago.

American Airlines Group is adding 150 new or restored routes this summer as it plans to fly more than 90% of its pre-pandemic domestic seat capacity.

Airlines for America, a trade group representing large US carriers, said the industry has relied on aircraft filtration systems that remove viruses, disinfection and passengers attesting they are healthy and wearing masks.

“Multiple scientific studies confirm that the layers of protection significantly reduce risk, and research continues to demonstrate that the risk of transmission onboard aircraft is very low,” the group said in an emailed statement.

But the CDC said other factors may increase contact with the contagion. “Aircraft can hold large numbers of persons in close proximity for long periods, which are conditions that can increase the risk for transmitting infectious diseases,” according to the study.

The CDC’s general guidance on travel continues to recommend that people delay trips until they are fully vaccinated because it “increases your chance of getting and spreading Covid-19.”

While travel by air remains severely depressed since the pandemic erupted in March 2020, it has grown substantially this year.

An average of 1.4 million people a day have flown in the US this month, about double the roughly 700 000 a day in early February, according to data from the Transportation Security Administration. By comparison, about 2.3 million people a day flew on average in early April in 2019.

© 2021 Bloomberg

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