Extra emergency exits on 757s

Date:         20 Jan 98 01:29:26 
From:         "Mariano A. Buitrago" <mbuitrag@mail.utexas.edu>
Organization: The University of Texas at Austin, Austin, Texas
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I have noticed there are some 757s with a small emergency exit right behind
the wings.  When I have flown those aircraft, the main cabin is usually
partitioned in two compartments.  American's 757s do not have these doors
installed.  Is this an option, or a special requirement for these doors?

Thank you.

MB