There are real 3D planes that we model. The Extras, Caps, Lasers, Giles, Ultimates, Pitts etc, are real aerobatic planes out on the show circuit. If you notice, models of these planes are the only ones usually given a percent scale. Others like the Dazzler, Flip etc, don't have a real counterpart, so those don't get the scale size, percentage treatment.

Jesse