I am planning to book a one way redemption in Business for 2 adults on PRG - NRT using Diamond Club miles. My desired travel date is December 25 +/- 1 day and this is not openable for booking via the ICC yet. However in the past few week I have started using the ANA tool and M&M (for Swiss) to check availability from November up to early December in order to get an idea of the number of award seats released on this route.

Ideally I would like to take ANA (PRG - FRA - NRT) but it seems that ANA ex-FRA only has 1 business seat available for each flight. My second choice is Swiss (PRG - ZRH - NRT), but based on what I saw on M&M, Swiss only open up awards booking up to 300 days - which means I need to wait until end Feb to make a redemption with them. I also noticed that there is never a seat available for Saturdays departure for ZRH - NRT (my desired travel date - 25/12 is a Saturday!). Does anyone know anything about this?

Would be grateful if I can get some ideas from you guys who are more familiar with Diamond Club redemption. Is it too early to book the flight, or shall I wait a little longer and hope that ANA or Swiss will open up more seats? What are the other possibilities for Europe (Zone 2) - Tokyo redemption? I flew SK once, they are OK but I don't think I will be in hurry to fly with them anytime soon.

Many Thanks in advance