Experts: Using PB days, it was my understanding that in the past, upon getting a reg line, a pilot could use a banked PB day to drop a trip, and then pick it back up on the very same pcs run since drops run before pickups. (as long as no one senior had a blanket WS in and would get the newly dropped trip).

Is this still possible? Or did the rules change with an LOA awhile ago? The same LOA that changed "trip parking." If I did this on a noon PCS run, can I pick up the dropped trip at noon? Or do I have to wait till the 1700 run?