Variations in seat spacing?

Date:         19 Feb 98 01:34:11 
From:         John Stodola <stodola@hns.com>
Organization: Hughes Network Systems
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Folks,

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
stodola@hns.com            Hughes Network Systems
        At home I am MDGolf@aol.com