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Isn't the distance completely irrelevant in an airplane anyway, seeing as everyone is in a closed, pressurised environment with recirculated air?

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That would hold true if the virus would behave like a gas that dissolves in air. But it is carried by droplets that fall to the ground.

I would think there is not more wind in an airplane then in a supermarket. So the droplets that carry the virus should fall down to the ground in a similar fashion.

It is not really recirculated air. Most use compressor fan bypass air with one-way check valves throughout the cabin.

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