FYI airplanes do pull in fresh air too, they're not a completely sealed tube like people seem to think. The air itself in a plane isn't what concerns me, it's b

FYI airplanes do pull in fresh air too, they're not a completely sealed tube like people seem to think. The air itself in a plane isn't what concerns me, it's being so close to so many people and all the high contact surfaces that are rarely cleaned).