Most viruses, germs do not spread easily: US CDC on COVID-19 guidelines for air travel
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The US CDC has said that most viruses & germs don't spread easily in its COVID-19 guidelines which don't suggest following social distancing between 2 passengers inside a plane or keeping the middle seat empty. CDC has suggested 14 days quarantine for all passengers coming from overseas. It also noted that air travel needs spending time in security queues & airport terminals that brings you in close contact with other people.