We describe methods developed to interpolate and project flight paths of aircraft in controlled airspace over the continental US from aperiodic position reports. There are a number of unusual features of the dynamic displays we have developed. Our visualizations can be viewed from either a fixed or moving viewpoint. The direction and distance of the focal point from the viewing point is under program control (allowing viewing in a direction other than the direction of motion of the viewpoint). The maximum and minimum depth of field is under program control (allowing viewing of selected local subsets of the data).