What is an "Air Dribble?"

[Spence]

A1 cutting to the basket and A2 passes him the ball. A1 while running bobbles the ball without having caught it cleanly. He then gains control and scores.

As I'm coming back down bench side, opposing coach tells me "That's illegal. That's an air dribble." He says he reffed for 5 years and he knows that's illegal.

I explained that a)I know nothing about an air dribble and b)can't be a travel if control was not established. He kept going back to the air dribble.

As you can imagine, we were finished at that point.