Don't fly. Fresh air is ducted into aircraft from the outside via the engines, where it is compressed, then cooled when piped through the wings. Air at altitude has a considerably lower oxygen content. Cabin air is piped through the highly touted HEPA filter. This filter blocks all particles in the air 0.13 microns or larger. The problem is COVID 19 is measured in nano microns (1,000 times smaller). I'm a former airline pilot and I don't fly.
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