Futuristic tools to increase the efficiency of air traffic control systems must deal with the complexity caused by a mixture of different aircraft types and business models, increased traffic volume, and varying aircraft performance. A comprehensive Metroplex planning system can help coordinate flights between the enroute and Metroplex domains, and manage surface traffic, using Next Generation Air Transportation System (NEXTGEN) concepts. IAI has been awarded a follow-on contract entitled “MetroSim: Metroplex-Wide Flight Planning and Optimization.” MetroSim is an innovative Metroplex-based arrival, departure, and surface optimization system that seamlessly links with NASA’s Traffic Management Advisor (TMA) tool, the NASA-developed System Oriented Runway Management (SORM) tools and the FAA-proposed Terminal Flight Data Management (TFDM) system, and even with live or recorded flight data. MetroSim allows airport planners, traffic flow management experts, airline dispatchers, air traffic controllers, and pilots to reduce uncertainty in operations planning, recover quickly from disruptive events, maintain high throughput in adverse weather conditions, and handle uncertainties associated with irregular operations. It improves Metroplex flight management and the way aviation software is structured. For example, MetroSim can effectively manage the high volume of flights in the New York airspace effectively, and improve the arrival stream, departure stream, and surface operations without any infrastructure changes. This is achieved by a MetroSim architecture that has different tools based on analytic computations, physics-based computations and mathematical optimization calculations. The tools interoperate in a distributed computational environment requiring minimal data sharing between the tools, and no centralized database. The architecture allows Metrosim to be adapted to any Metroplex.