• Section 1, Introduction, summarizes the challenges that inspired this research effort, and its scope. • Section 2, Benefits Mechanisms, describes the current practices in NAT OTS environment, and elaborates the benefit mechanisms enabled by reducing separations between equipped flights. • Section 3, Modeling, describes the models used to analyze benefits from reduced separations, including future demand generator, track selection model, fuel requirements models, and simulation model of airspace track operations.

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