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Thread: should a plane weigh the same before and after the flight?
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Old Jun 24, 2010 | 3:32 pm
  #30  
nerd
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Originally Posted by djk7
That is one of the reasons that the airliner industry gives for recycling a portion of the air, to keep the humidity from being lower than it already is.
This page from Boeing seems to indicate that it's a fuel-efficiency trade-off:

http://www.boeing.com/commercial/cabinair/

See the last 2 paragraphs on the page.
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