Emergency exit seats
Can one of the resident CC (Tightslot, are you there?!) answer a question for me...
Was flying MAN-AMS on the Big Blue airline recently. 734, roughly 35 pax on board. Everyone shifted back to behind row 18 for weight & balance reasons, maybe one or two in biz. Hence, not a single overwing exit seat was occupied. The closest available person to the exits was at least 5 rows away and I noticed they weren't briefed in the usual manner about opening the hatch. Is it permitted to have emergency exit seats unoccupied, or is it dependent on how many pax on board and where they are seated?