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   Implements an aircraft control system. Action is either 'initialize' or
   update. You implement your controller in this function.
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   Form:
   y = AircraftControl( action, d )
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   ------
   Inputs
   ------
   action         (1,:)       Action for function
   d              (:)         Input

   -------
   Outputs
   -------
   y              (1,1)       Output depends on action

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