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Thread: should a plane weigh the same before and after the flight?
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Old Jun 22, 2010 | 9:00 am
  #11  
B747-437B
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The ZFW (Zero Fuel Weight) of an aircraft is assumed to be the same upon landing as it was at takeoff.

In addition to fuel, there is also consumption of hydraulic fluid, engine oil, lubricants, etc... during the flight but the quantity is negligible in this context.
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