BP... the only ones who are eligible to slide across in the left seat are those who went to the classic from the pax fleet seniority list. I am not that familiar with the fleet, but can't think of any that went across who are now trainers. AR is the only one I could think of, but after his recent article in Screw Yous I don't think he could survive having a classic amputation.
Yes guys have come from a classic command to the Pax fleet, but they were already entrecnhed on the Pax seniority list, not direct joiners to the freighter.