spacing but if they can passengers should seat six feet away from each other and being against one person in flight is not as dangerous because of the sophisticated air filtration systems inside passenger place. the riskiest places, the terminals. the real risk is when you re waiting to board the plane, checking in and getting off the plane where people are congregating, people are tired and fatigued wearing the mask and it easily comes off their face. they want to get something to drink or eat. very vulnerable times. passengers should interact with airline personnel about covid safety. ask them questions before you board a plane, questions like when was the last time they fully cleaned the plane and whether the plane has safety features like hepa filters. brian todd, cnn, reagan national airport. so much good information there. let s talk more about all of it. we ve got dr. carlos del rio, executive associate dean at emery school of medicine.