His seniority, or his monthly time in seat 60BD?? the 60 BD is time in position, .. his seniority for bidding leave, roster etc...etc remains to be seen..hopefully for that person it's based on his time in service with GF as a productive flt deck crewmember eg: flt eng, f.o. capt, so he would be able to "outbid" say a 10yr DEC...as it should be