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Message: [QUOTE="SVCBeercats, post: 3480961, member: 7874"] The outside air comes from the jet engines prior to combustion. It is compressed and some of it is routed into the cabin while the bulk is combined with the fuel. Prior to entering the cabin the air is cooled since compression heats it. It then goes through HEPA filters. The resulting air is similar to air found at aproximately 6,000 or 7,000 feet. No oxygen is added. Apparently the compression concentrates the oxygen content. There probably is more exposure to airborne germs in the terminal. People are clustered together rather closely around the gate area. Also I recall being trapped inside a plane in Minneapolis on the tarmac for over an hour in the summer, This is bad since the air conditioning is generally not active in such cases irrespective your discomfort. [/QUOTE]