Not exactly sure why, but I was looking on AA and BAEC earlier this week and could see availability for a couple of JL F flights on BAEC but not on AA. It wasn't phantom availability as I booked one of them through BAEC. I assumed it was just some sort of restriction on AA availability given how relatively cheap AA partner redemptions are. Is AM not live availability? I know JL's own system isn't live so available flights show up on BAEC first.