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Originally Posted by Guava
You can only book ANA Japan domestic reservation no earlier than 2 months before the flight date. This applies to both revenue and award reservations. In other words, you need to wait till mid-June in order to book your ANA domestic flights and see if it's available, assuming of course, it's not being *A Net filtered by UA!
I guess YMMV, but I've booked NH domestic segments as part of a transpacific award (e.g. US-NRT-ITM) many more than two months in advance - indeed, I've done it 8-9 months in advance before, and am holding such a ticket right now.