A1 inbounds the ball at the division line; A2 jumps from the frontcourt, controls the ball in the air, and while still in the air passes it to A3, who is in the backcourt.
Backcourt violation. COMMENT: The throw-in exception only applies to the player initially receiving the throw-in pass (first touch). Since the throw-in has ended, all backcourt rules apply. Had A2 just landed in the backcourt, there would have been no violation.