Either I'm going crazy, or someone is actively changing the way AC is handling the NRT connections. I still maintain that AC1 to AC9851 was perfectly valid a few weeks back, the SE desk was willing to sell it me, but couldn't get J.

Yesterday ac.com was showing AC3 connecting to AC9556 (a 1.5 hour connection) as a valid connection and still shows it when you do a timetable search. However, it is no longer showing on AC.com. If it's not valid, I'm not sure what the point of codesharing AC9556 if you cannot connect to it.

Added... okay I know I'm not crazy on this one. My return flight doesn't meet the minimum connection window either AC9555 connected to AC2 - 1:35 connection window. When I purchased it was definitely fine and valid, but now is no longer offered for purchase.

Hopefully this is all a mistake as creating valid connections is going to waste hours of my time.