Aviation Flying might just be safer than grocery shopping, finds Harvard study Updated : October 29, 2020 07:06 PM IST A Harvard University study found that specialized onboard ventilation systems filter out 99 percent airborne viruses. Moreover, the downward direction of airflow prevents the virus from droplets from one passenger to affect another. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.