Date of Construction

From:         laewell@iastate.edu (Lars A Ewell)
Organization: Iowa State University, Ames, Iowa (USA)
Date:         12 Mar 94 10:30:39 PST
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	I recently flew Northwest Airlines from Des Moines 
to LaGuardia.  When boarding the DC-9 from Detroit back
to DesMoines I noticed a black stamp inside the door that 
had the place of manufacture (Long Beach) as well as the date.
The date was 1966.  I was surprised that the plane was that 
old.  Are many of the DC-9's this old?  In addition, are
planes required to have the date of manufacture posted like
this?

	thanx,

	Lars Ewell