Most airlines refer to narrow body as anything with one aisle and wide body is anything with two aisles...B-717/727/737/757 are narrow body and B-747/767/777 and I think 787 are wide...DC-9/MD-80/88/90 are narrow and DC-10/MD-11 are wide...A-319/320/321 are narrow and A-300/310/330/340/380 are wide...Did I get that right?