Originally Posted by
Mr. Tickets
Others can and will chime in, but I am not sure I would expect even 50% upgrades (Platinum or Diamond) traveling Sunday night/Monday morning and Friday night.
Agreed. Success will depend on fare classes purchased and routes. If he's buying far enough ahead and meeting other fare rule requirements (min/max stay typically) to get U,T,X,V fares, 50% as a Plat may not be achieved.
I think the OP could find disappointment at UA and AA, too, below top tier.