There is a WSJ article from 2011 about flying in the age of germs, and they recommended that even just using a moisturizing spray helps, bc dry tissue is much more susceptible.
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Will completely destroy your skin and mucus membrane microbiota

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...not to mention your dating life
End of conversation
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Saline solution on flights is good too. Your mucus is fly paper. If it dries out, nothing to catch germs. So mask and saline solution in sinuses to keep moist
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