Originally Posted by
DL Platinum
Story one: the GUC is ONLY a "one" cabin upgrade, so if you are coach it moves you to Premium Select, and you cannot use two to make the jump to D1, if you buy premium select, you can then use it to bump to D1. Story two: If D1 is available in an upgrade bucket, yes you can move from economy (not basic) to D1
Story One is directly contradicted by the Delta web site, in the table under "Waitlist Options"
Story Two is explicitly shown there, and there have been reports of such in the master GUC Success thread.
https://www.delta.com/content/www/en....html#waitlist