Abstract: Embodiments provide an advanced decision support tool to enable automated aircraft sequencing and conflict detection and resolution. The tool can be used to assist an air traffic controller (ATC) in determining merging, sequencing, and spacing resolutions; communicating the resolutions to the aircraft; and monitoring execution and compliance with the provided resolutions. According to embodiments, the tool can incorporate a broad range of inputs (e.g., surveillance data, weather information, aircraft equipage, etc.) and can be configured according to different aircraft sequencing modes of operation (e.g., one mode of operation is to minimize aircraft deviations necessary to resolve a particular conflict). In an embodiment, the tool includes a controller interface, which may be integrated within the controller interface of existing ATC systems or implemented separately. Embodiments can be implemented using software, hardware, or a combination thereof.