Originally Posted by PRS Guitars

They did a workaround that isn't good IMO. When the primary cancels, the alternate becomes the primary, and is notified via text or email...but has to re check in. So they lose their place in line in the non-rev queue. No big deal on a full flight where you'll be in he cockpit anyway, but on a flight with open seats, could cost you a first class seat, or put you into a middle seat.