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'Fresh' is an interesting term.
One of the reasons that aeroplanes are such germ incubators is that the air is dry and dries out sinuses so removes one of the ways the body use to stop germs spreading. Also look at the age of planes and if you are flying on a plane that still has ash trays....then look up how these planes get their 'fresh air'.
lynx
Amazingly the fresh air arrives via a vent inside the engine nacelle.