This report provides a detailed analysis of the impact of Area Navigation (RNAV) on ATC controller's tasks and the resulting productivity of control sectors, and of the impact on airport and enroute system capacities. The results are expressed in terms of projected savings in ATC controller staff growth requirements (man-years and dollars), and in terms of savings in aircraft delays (aircraft time and fuel consumption, and dollars). The terminal area and enroute (high and low altitude) environments were considered separately. The analysis considered the time period from 1982 to 2000. The effects of other features of the Upgraded Third Generation ATC System on controller tasks and system capacity were considered directly in each analysis. All dollar results were computed as 1976 present value equivalents which were used to update a comprehensive RNAV benefit/cost analysis from an earlier report under this contract. (Author).