Checking the LX 777-300ER seat map for an upcoming flight where we will be sitting in Economy. After logging in to my booking I can see some of the seats on rows 27-34 are so-called XL seats that can be reserved for CHF 99. Row 27 I can understand is designated as XL due to the bulkhead or divider to PE, but on rows 28-34 only seats D, E, F, G are XL seats, while A, B, C and H, J and K are not. Does anyone know what makes the seats in the middle "XL"? More legroom?