American Airlines has been uniquely stingy making award space available on its own flights. I value American miles, but really just because I can book awards on partners like Cathay Pacific and Etihad.
Over the past few years there have been availability ‘dumps’. There will be a day or two or sometimes just a few hours where tons of international business class award space opens up on American flights. We haven’t seen that in many months, but are seeing it again right now.