This article is from the ER FAQ, by Rose Cooper firstname.lastname@example.org with numerous contributions by others.
The cable channel TNT (Turner Network Television) has bought
the syndication rights to "ER" episodes through 1998. Apparently--
unfortunately--this currently only applies to the US version of TNT
Reruns of "ER" began Sunday September 6, 1989, on US TNT, at 8pm
Eastern, with a showing of the 2-hour pilot, "24 Hours". It was shown
again at 5pm Eastern on September 7, followed by the next episode in the
series, "Day One", at the regularly scheduled 7pm Eastern rerun slot. It
is supposed to be shown in consecutive order every weekday (Monday-Friday)
in that time period (check the ER Episode List
<http://digiserve.com/er/erlist.html#tnt> for updates).
In addition, TNT kicked off the festivities with an special TNT
edition of the CNN show, "Larry King Live", on Saturday September 19 at 9pm
Eastern, with the cast taking viewers' questions from the set of "ER".