U.S., Oct. 28 -- A new gate-to-gate study by scientists from Harvard's T.H. Chan School of Public Health is the most comprehensive research to date to conclude that the layered approach U.S. airlines, including Delta, have taken to protect customers and employees from COVID-19 means the risk of exposure during air travel is very low.

To date, the Centers for Disease Control and Prevention has not confirmed a single case of COVID-19 transmission on a U.S. airplane.

"The risk of COVID-19 transmission onboard aircraft [is] below that of other routine activities during the pandemic, such as grocery shopping or eating out," the Harvard researchers concluded. "Implementing these layered risk mitigation strategies.requires passenger and airlin...