[DoreenMichele]

I imagine oxygen masks in airplanes aren't as sterile as needed.

Planes are horribly cramped and if you filled every seat you would be violating social distancing while filling them with sick people.

I can think of a few other criticisms, but those are probably the most defensible concerns.

[fredophile]

If everyone on the plane already has covid-19 then social distancing doesn't matter.

[DoreenMichele]

If only disease actually worked that way.

Covid19 is not the only germs they will be carrying. The people who are the sickest are the ones that most need oxygen supplementation. Reports suggest that most of the people dying from it already have other serious medical conditions.

This is exactly how antibiotic resistant infections get bred. You would be creating a melting pot of horribleness and cross-contamination and god-knows-what would come spewing out of it.