On the circle course of the learning to fly mission, my plain runs out of power before I can get high enough to go through the first corona...why is that? I can't get passed this mission because of it. So if I fly around for a little bit so that I can get high enough to go through the corona's, then I finish the course I still don't pass it or even get a score. Even if I finish the course in under two minutes. Anyone know why?