[luvbach1]

6. Recirculated air in planes spreads disease.

If that's a myth, why do I almost always get a cold shortly after air travel? Also, why does the air coming out of the directional air vent sometimes smell like bad breath?

[Ditter]

You probably caught the cold in the crowded airport and if the air is blowing into your face, you are smelling your own breath. :)

[aviator]

If that’s a myth, why do I almost always get a cold shortly after air travel? Also, why does the air coming out of the directional air vent sometimes smell like bad breath?

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Keep yourself hydrated and your sinus membranes will do a better job of keeping virus germs out.