Originally Posted by
vysean
1. Often when I see availability on the ANA tool and call the airline to book, I'm told "oh, we don't see any availability" and "each airline releases a block of seats to each partner - we might have used our block already". Do *A members release award seats individually to other *A members (e.g. NZ releases one seat on NZ005 to UA and one to US), or do they simply open up O, I, and X for any member carrier to book (for example opening up I5 and X5 on NZ005 for all to see)? I suspect it's the latter, but I am not an expert on how this stuff works...

You suspicion is correct. Each carrier just releases award inventory to all and not to each member individually. And all are equal. But as we know, some are more equal than others and there are a few more restrictions in the fine print.