Sorry to kick an old thread, but I'm curious because Delta specifically says the opposite of what everyone else in this thread says.
http://www.delta.com/content/www/en_...-benefits.html
Then click on "Alaska":
Lounge Access (1): (√) for GM/PM/DM
(1) Lounge access is available with a same-day boarding pass for international travel. For more information on Alaska's Lounge access, please visit Alaska Airlines.
I realize AS isn't in SkyTeam, but it seems strange that they'd explicitly list it. Unless it's a copy/paste error, which wouldn't really surprise me.