RealFlight G3 and Ikarus Aerofly Pro Deluxe are both outstanding 3D learning tools. I personally prefer AFPD but you cannot go wrong with either one. Both have nice features for adjusting the physical setup of the plane as well as great physics engines. I think AFPD has a slight edge in the realistic way that the planes stall. The downloadable planes that other users have made up for AFPD are good too some better than others. There are some that fly a little too much like they have helium in them but the Planes from Rodeos Download website and the ones that come stock with AFPD are pretty doggone close.