We are headed to Rome, Italy in March 2013. We are flying Alitalia on a 777. My question is on the seating arrangement. When I look at the seat layout it shows 3-4-3. For several rows, that first seat "D" I believe, sits by itself. I assume that is not the case. All the seat plans I can find show the 777 as being 3-3-3 configuration. Can anyone help me understand this layout?