Variations in seat spacing?

Date:         19 Feb 98 01:34:11 
From:         John Stodola <>
Organization: Hughes Network Systems
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I just flew in coach from BWI to Puerto Vallarta via Houston and back on
Continental.  Had four different planes: 737, MD-80, DC-9 (new), and
DC-9 (old).  The seat spacing in the first three seemed to be the same.
But the older CD-9 had seats much closer together.  Didn't have a tape
measure handy, but the spacing differene was obvious.

My question: is it common for a carrier to have different seat spacing
for the same service class?  Is this determined by the plane type?

Thanks for any enlightment...

John Link Stodola          Principal Writer            Hughes Network Systems
        At home I am