Seems that LX is blocking seats. I just pulled up the F seat maps for May01 and May02 of next year - and some seats are 'occupied' or not existing:
This flight has F6:
[KVS Availability Tool 7.3.7/Diamond - Seat Map: 01 May 2015/LX 39/SFO-ZRH/343/F-First]
Code:
A | B C D E F G | H J K
1 - -
2 - + +
[+] Available [W] Wing [L] Lavatory
[-] Unavailable [E] Exit Row [U] Upper Deck
[P] Preferred [|] Aisle
This flight has F8
[KVS Availability Tool 7.3.7/Diamond - Seat Map: 02 May 2015/LX 39/SFO-ZRH/343/F-First]
Code:
A | B C D E F G | H J K
1 + +
2 - + +
[+] Available [W] Wing [L] Lavatory
[-] Unavailable [E] Exit Row [U] Upper Deck
[P] Preferred [|] Aisle
Also F8:
[KVS Availability Tool 7.3.7/Diamond - Seat Map: 03 May 2015/LX 39/SFO-ZRH/343/F-First]
Code:
A | B C D E F G | H J K
1 + +
2 - + +
[+] Available [W] Wing [L] Lavatory
[-] Unavailable [E] Exit Row [U] Upper Deck
[P] Preferred [|] Aisle