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The aircraft cabin humidity level is set to 20%, so it seems the aircraft cabin is drier than the Sahara desert.Sara Desert has about 25% humidity.So it seems that you are flying in a desert humidity, but only their temperature is controlled. Do you know our tastebuds are reduced when we fly to the aircraft? There was research that shows because of the cabin pressurization system, our taste buds reduce about 30%.The cabin pressurization and the humidity control sometimes effects on our tastebuds which is Change a lot from man to man.