This article is from the The Simpsons FAQ, by Ondre Lombard wakkojr@nospam.wcat.com and Andrew Gill superluser@mail.rit.edu with numerous contributions by others.
Episodes that have already had their seasonal run on Fox have been made
available as a syndication package by Fox. This means that any station can
buy it and show it at any time they choose, not just Fox Network
affiliates.
The Simpsons began their syndication run in September, 1994, a little after
it reached its 100th show. Once a series reaches its 100th show, it will
wind up in syndication.
 
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