Unless they have changed it recently, every month in which AA holds a class, 10 PSA pilots flow. It doesn't matter how many AA is hiring or whether there is a surge of pilots from elsewhere - if they hire in a given month, 10 PSA pilots flow. That could change. AA can also game the system and run classes every other month. But on the whole it's reasonable to expect about 100 flows/year from PSA to AA indefinitely. The huge unknown is how many people leave PSA for other jobs. That's what really drives flow times.