Talking about configurations; EK have 3 diferent cabin lay-out on the 777/300ER
A. Frames with C42 Y386
B. Frames with F8 C42 Y310
C. Frames with F8 C42 Y304 These have a crew-bunker area and are needed for ultra long flights to SEA, IAD, ADL, BOS, ORD or GRU for example.