Just wanted to write a brief update on an AA booking issue I've been facing. Was trying to book JAL one way with miles, from SGN, through HND, and onto USA. The flight would appear in my search randomly. Most days it wouldn't be there, but some days the flight would appear, but then disappear just as quickly. Sometimes I would be able to select the flight to try and book it, but then I would get thrown into a loop with an error "Please select another flight or fare". The same flight appeared again when it reloaded, so I would select it a second time, threw me in the same loop/error, but now the flight disappeared. I was baffled. I really wanted this specific flight, because it has a long layover in HND (we are trying to do some shopping before we return home). The alternative was through HKG on Cathay Pacific, which we didn't find too interesting, taxes were more, etc. So I have been resolved to get this flight for weeks now, to no avail.
After doing some digging on Reddit, and many people mentioning "phantom JAL availability", I decided to take some other people's advice and call. The agent in the Int'l dept searched for the flight, and it did not appear for her. She had to piecemeal the flight together as a multi-city, with the exact stops input, and THEN it did appear for her. She said when this loop error occurs, it usually means the flight is unavailable/full (no partner awards). (But on Reddit, there are theories that in the past 6 months there was some kind of update to AA, and now JAL flights are harder to book.) Anyways, she was able to put the flight ON HOLD, not book it. She said I had to wait 24 hours for the partner carrier to approve/deny the reward flight, since her thought was that it's not available.
This morning 24 hours had passed so I called back, and now the new Int'l agent I spoke to said "I have NEVER heard such a thing. If the flight is available to put on hold, then it's available to be ticketed." So she claimed the first agent was incorrect (which matches with Reddit's theory of just a problem booking these partner flights online). She ticketed the flight, charged me the miles and taxes, and I got confirmation email and the flight appears in my AA app.
Just wanted to add my experience in case anyone is going through anything similar, or finds themself in this situation in the future (as I know a lot here travel to/from Japan).