Airspace  Chapter 15  Introduction  The two categories of airspace are: regulatory and  nonregulatory. Within these two categories, there are four  types: controlled, uncontrolled, special use, and other  airspace. The categories and types of airspace are dictated  by the complexity or density of aircraft movements, nature  of the operations conducted within the airspace, the level of  safety required, and national and public interest.  Figure 15-1  presents a profile view of the dimensions of various classes  of airspace. Also, there are excerpts from sectional charts  that are discussed in Chapter 16, Navigation, that are used  to illustrate how airspace is depicted. 