The Flight Schedule Monitor (FSM) is the main tool for the traffic management specialist at the FAA David J. Hurley Air Traffic Control System Command Center (ATCSCC) to monitor, model, and implement Ground Delay Program (GDP) operations. FAA and airlines use FSM to monitor demand through receipt of FSM demand pictures of airports updated every 5 minutes. FSM constructs if scenarios for best options (i.e., best parameters) prior to making a GDP decision. Modeling may be used by: (1) the ARTCC Traffic Management Coordinator (TMC) to request ATCSCC implementation of a GDP in the event of significant congestion or if a demand imbalance is projected at an en route fix, route, or sector; (2) the ATCSCC to determine Air Route Traffic Control Center (ARTCC) start times, Airport Arrival Rate (AAR), and other parameters for a particular GDP scenario; and (3) the Airlines to see the effects of canceling or delaying a specific flights under a GDP.