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Economy seating on the 747 is mainly in a 3-4-3 layout (A,B,C - D,E,F,H - J,K,L). However, at the rear, seats B and K are missing and the layout also varies at the front where the nose narrows.
Rows one, eight, 30, 42 and 52 are good choices. Also good are Seats 9A-C and J-L, 6D and H and 2C.