[Adam]

I'm not sure if I'm reading this correctly.

1. I can't tell where A1 was when he passed the ball. Was he in the FC or the BC? Since you said "as A1 crosses...." I'm having a hard time making that decision.

2. From your description of A2 being airborne over the division line, I have to assume he had jumped from the BC.

Here's how I'm reading this play:
A1 crosses the line, gains FC status, then passes the ball to A2, who is airborne after having jumped from the BC. Where he lands is irrelevant if he catches the ball in the air. This is a violation as soon as A2 touches the ball.