aircraft production economics

From:         jim watson <jim.watson@bris.ac.uk>
Organization: University of Bristol, England
Date:         17 Dec 95 14:06:23 
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I sam trying to find data relating to hoe design continuity in
 sucessive generations and models of large commercial jet aircraft
relates to thre manufacturing economics.  eg how much of the wing
 design is carried over and what changes are made, can anyone help?

Cheers

jim