NASA selected Sensis Corp. for the Aeronautics Research Mission Directorate (ARMD) Super Density Operations Airspace Design (SDOAD) project. As part of its NextGen initiative, NASA is examining a number of new operational concepts aimed at addressing current and future capacity challenges at major U.S. airports. To best test and evaluate these concepts, airspace definitions, including operational procedures and routes, must be developed. Sensis will be modeling the arrival and departure traffic routes for six major Southern California metroplex airports including Los Angeles International, Burbank, Ontario, Long Beach, Santa Ana, and San Diego. The project will entail characterization of traffic flow route and altitude ranges; analysis, modeling, and design of continuous descent and standard arrival procedures as well as future departure procedures; and trajectory based evaluation of the modeled procedures. NASA will use the definitions to accurately test new concepts, including automated arrival concepts.