This document describes ICF's NetWorks® airline network planning and simulation model. NetWorks® is a powerful tool that airlines can use to model traffic flows, evaluate schedules, and test "what if" scenarios. It integrates data on markets, schedules, fares and costs to estimate traffic shares and allocate passengers. NetWorks® enables airlines to assess their network's strengths and weaknesses, and reduce financial risk through scenario analysis. The document outlines NetWorks®'s functionality and provides examples of the reports it can generate.