[Nevadaref]

This question is not as simplistic as it first appears.
Most of us would say that this play is not a violation, and the reason is that Team A never established control in the frontcourt.

However, if one follows Situation 10 from the NFHS Interps a couple of years ago (2007-08), then an argument can be made that the ball was controlled while it had frontcourt status. I believe that is wrong and that Situation 10 is a bogus ruling, but it was an official NFHS ruling.

2007-08 Basketball Rules Interpretations

SITUATION 10: A1, in the team's frontcourt, passes to A2, also in the team's frontcourt. B1 deflects the ball toward Team A's backcourt. The ball bounces only in Team A's frontcourt before crossing the division line. While the ball is still in the air over Team A's backcourt, but never having touched in Team A's backcourt, A2 gains possession of the ball while standing in Team A's backcourt. RULING: Backcourt violation on Team A. Team A was still in team control and caused the ball to have backcourt status. Had A2 permitted the ball to bounce in the backcourt after having been deflected by B1, there would have been no backcourt violation. (4-4-1; 4-4-3; 9-9-1)