Thanks for the seat maps - very helpful.

On the map provided, what is the "S" behind row 74 (also behind row 79)? It doesn't seem to be covered in the legend.

Also, anyone have comments about row 74 seats (upper deck) on 747? Is row 74 (upper deck) preferable to row 12 (main deck)? Any other suggestions on best/worst seats? Of course seatguru doesn't cover LY.

Thanks.