Designed play jumping out of bounds.

[Nevadaref]

Originally Posted by Freddy

9-3-3: "...unauthorized..."

It pays to know your history!
When the NFHS put in rule 9-3-3 it also published the following interpretation:

2007-08 NFHS Basketball Rules Interpretations

SITUATION 5: A1, while being defended, is driving from near the free-throw line extended toward the end line. A1 continues toward the end line and pulls up and goes airborne just before the boundary line with his/her momentum carrying him/her out of bounds. Just as A1 goes airborne, he/she passes off to a teammate across the lane and lands out of bounds. RULING: No violation. A player's momentum, after performing legal actions on the court that results in taking him/her out of bounds is not a violation for leaving the floor for an unauthorized reason. However, if A1 purposely or deceitfully delays returning after legally being out of bounds to gain an advantage, a player technical foul would be assessed. (4-4-3; 9-3-3; 10-3-3)