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Analytical studies indicate substantial aircraft performance benefits can result from proper application of energy management principles, and that conceptual approaches involving close coupling of aerodynamic, propulsion, and control technical elements are required to achieve these benefits. Analytic tools used in these studies include a modified Rutowski technique for simultaneously optimizing throttle position and flight path. Pilot-in-the-loop simulation results are presented and the use of advanced pilot displays utilizing energy management techniques are described. Factors affecting the implementation of Flight/Propulsion Control Integration (FPCI) techniques for energy management are considered. Elements of fly-by-wire control augmentation systems, electronic engine controls, advanced pilot displays, and automatically controlled inlet and nozzle systems in future aircraft designs are discussed.