Why no Tristars?

Date:         06 Apr 99 11:46:13 
From:         richard@wretched-z.demon.co.uk
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	Sorry if this is an obvious question: I've checked the FAQ and
it doesn't seem to be there.  The question is: having travelled in the
US, Europe and Asia, I see plenty of DC10's and older 747's, but I
never see a Tristar these days.  Why is that?  Did the marque fall
from commercial favour or dod Lockheed withdraw support....or did they
just _go_ somewhere?