Since the start of the millennium, the development and production of UAVs has been the central focus of aviation engineering. Concurrent with this trend has been the ongoing modernization of the systems for managing air traffic-to accommodate the ever-increasing demand for a finite airspace. The operational objectives of these systems are complementary and require similar technologies for distributed control and automation. The federal roadmap for the Next-Generation Air Transportation System (NextGen ATS) underscores the need to mix the operations of manned and unmanned vehicles.
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