Airlines and aircraft manufacturers have touted the robust ventilation in cabins, with the constant introduction of fresh air from outside the plane, as protection for passengers against virus transmission. But travelers should be aware of the one time in many trips when airflow is reduced: deicing.

The process, which usually takes 10 to 20 minutes, is essential for takeoffs in wintry weather. As deicing fluid is sprayed on jets, outside air is shut off so fumes and fluid don’t get into jets. Air inside the cabin continues…

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