Moderator, Omni, Omni/PR, Omni/Games, FlyerTalk Posting Legend
Join Date: Oct 2004
Location: Between DCA and IAD
Programs: UA 1K MM; Hilton Diamond
Posts: 72,668
As a rule, UA will not grant double-upgrades.
Your hope is that someone in C is trying to upgrade to F (or gets op-upped to F), which would open a seat in C into which, depending on your position on the waitlist, you may clear.