Benedict Carey is a science reporter with The New York Times. His article is republished here with permission as part of our licensing program. We welcome your comments below.

The millions of airline passengers who traveled over the holidays experienced firsthand the unsettling uncertainties that come with flying during a pandemic. The anxious glances. The awkward semi-distancing. The haphazard mask etiquette, and the absence of regular service.

In an effort to reassure, the airlines have updated and adjusted their . . .

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