Electrical Engineering/Faraday Cages

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Question
Could you please explain to me why a faraday cage built into the haul of an airplane is able to properly function seeing as to how it is not grounded?

Answer
Here is an overview of the Faraday cage:

http://en.wikipedia.org/wiki/Faraday_cage

And here is another discussion about airplanes and shielding:

http://airlineworld.wordpress.com/2007/12/18/can-lightning-bring-down-a-plane/

http://www.askacfi.com/914/what-happens-when-aircraft-struck-by-lightning.htm

A Faraday cage inside an airplane functions as a closed electrical system; self contained.  Charge built up inside can dissipate inside the enclosure.  If a collection of charged particale build up causing a dc voltage the cage can be grounded to the chassis of the airplane and the voltage generated will leak off into the atmosphere, probably.  As the airplane traverses at high speeds excess build up of voltage can be swept off by the high velocity air passing by.

Hope this helps.  

Electrical Engineering

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