There are many, many different configurations on the 757. In all the 753s there is the mid cabin galley but not on all the 752s. AAs 757 hav 8 extra Y seats instead of the galley and lav. Their TW 757s however, do have the mid cabin space. NW & ATA have this but UA & CO don't. I thought that maybe the longer haul flights use the mid-cabin galley but it isn't the case. COs 757 International config don't have it either. Is there an ops advanntage of taking away seats and adding the extra lav and galley?