I bought a ticket for my nephew on flights that I will also be on but with a different PNR. When I bought the ticket I was able to choose exit row seating for him at no additional charge. I am wondering if as the time for the flight approaches CO might notice he has an exit row seat without payment of the additional charge and remove him from that seat. My MP # is somehow linked to his reservation though, since it shows up in my intineraries. Can a CO platinum sponsor an exit row seat for someone on a different PNR?