A FlyerTalk Posting Legend
Join Date: Sep 2012
Location: SFO
Programs: AC SE MM, BA Gold, SQ Silver, Bonvoy Tit LTG, Hyatt Glob, HH Diamond
Posts: 44,331
No, because Flex L on AC credits 100%, but Flex doesn't exist on UA, and L earns 50%.
If you want 100% on UA operated flights, you need W or higher.