Well, some of the ex-Swissair MD81's flying for SAS are on their way out. These are the oldest MD80's around in the world and they are scheduled for Midwest Express in the US who fly these planes in an all-business 2+2 cabin layout.
Some speculation about which unit may be in question can be found at my MD80 site at
http://surf.to/md80 or
http://www.dlc.fi/~andelin/md80spot.htm
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Jan-Erik Andelin
MD80 INTERNATIONAL FORUM
http://surf.to/md80