Keep in mind that you can be contagious without being symptomatic. Ergo, you are your only source of protective behavior. Follow proper etiquette in public and there's a slight risk, or you can choose to stay home. Any sort of more restrictive behavior really won't be too effective. In my personal opinion, I'm not changing my behavior much at all...airplanes or otherwise. But then, I'm not in a high risk group (aka. elderly or immune compromised).
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