If the Airborne playing does not have LGP; then they are responsible for the contact.
A1 with ball is stationary - B1 comes from the side and Jumps to get in front of A1. A1 dribbles forward and contacts B1 who is still in air. This is a foul on B1 as B1 never had LGP, even though A1 did not give him a place to land.
If B1 has LGP; and they jump forward into the path - I believe B1 is responsible for the contact as a defender can not move forward into the path of A1, they can get to the space first but not move into A1.
Generally, you see this play as a defender comes flying to block a shot. A1 pulls the ball down and dribble drives, moving into the landing space of B1. B1 lands on A1, 100% of the time this is called on B1.
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