How Old are DC9-15's

Date:         04 Jun 97 01:45:42 
From:         baejs3201@aol.com (BAEJS3201)
Organization: AOL http://www.aol.com
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Can anyone out there tell me how old DC9-15'2 are there's on where I work
and I can find the builters plate to see how old it is.

Thanks
David
Santa Barbara Aerospace