Originally Posted by
WineCountryUA
Doubt there will a way for the agent at the scanner to know otherwise.
I suspect UA will have to map out some sort of new scheme to police this. Today's approach of YMMV and 'agents mostly saying nothing under most circumstances' is incompatible with charging for priority boarding. You've also got your agents who allow alternate priority (i.e. if you're wearing a Chicago team hat, you board ahead of GS at DEN). They'd have to put a stop to those shenanigans
.