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have an even larger protective effect for droplet exposures than they do for aerosols.
Current CDC guidelines recommend against travel for people who have not been vaccinated.
"Physical distancing of airplane passengers, including through policies such as middle-seat vacancy, could provide additional reductions in [Covid-19] exposure risk," the authors wrote.
Along with Delta, Alaska, Southwest, JetBlue, Hawaiian and Frontier blocked at least some seats early in the pandemic.