Absolutely nothing. Sassy could fly fine. She could even fly a hand launched combat plane and land it...on a buddy chord, or even without a buddy chord with the support of someone standing next to her. But once on her own, with all the cards on the table, nerves took over. Understandable nerves...with the risk of a lot of work and money one mistake away from disaster, with no one to flip a switch or grab the Tx. Sassy also had a lot of time in on Real Flight, and could fly it fine also. It boils down to once the fear was removed, she never looked back and has been having fun ever since.