SAS has two areas curtained off at the back of their cabins, each with two rows of J seats [2x2] which are reserved for crew. I noticed them slipping back there after main cabin service was completed on both recent trips across the Atlantic, to eat their meals and rest. AC doesn't appear to have any crew seating save for the jump seats in the back of the cabins [and 5A on ex-CP 767s for pilots]. If loads are light up front, it does make sense to consolidate passengers in the main J cabin.