Airliner air quality

[srixon 1]

Conventions are the worst, #conflu

Planes etc never an issue, air always good.

I fear the tube will give me something nasty though, that air is weird.

Black snot is what you get from riding on the tube.

 

[HomerJSimpson]

Black snot is what you get from riding on the tube.

Is that like white dog poo? (although you never see to see that anymore)