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Tactical trajectory replanning for efficient conflict avoidance

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Strategic trajectory replanning to minimize constraints and eliminate conflicts while meeting up-to-date arrival times

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Procedures and tools that allow user-ATSP collaboration to meet ATSP requirements while maximizing user benefit

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Enhanced situational awareness through display of traffic, weather, and SUA information

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Advanced CNS capabilities

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Taxi navigation information and displays

3.5 Aeronautical Operational Control (AOC) Perspective
In the tactical mode, the AOC will have access to real-time information on the status of the NAS, and the ability to dynamically adapt their operations to changes in the NAS. In the strategic mode, the AOC will be able to provide preferences and priorities to the ATSP and to the aircraft in their fleet, presenting an opportunity to dynamically influence the status of the NAS. This will be accomplished through the following technologies and capabilities:
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Information exchange with the ATSP and FD, such as . Weather information . Traffic displays and data . Traffic complexity parameters . SUA status . Desired arrival times

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Advanced communications capabilities

4. DESCRIPTION OF DAG-TM CONCEPT

4.1 Formulation of DAG-TM Concept
The DAG-TM Concept was formulated as a coherent set of solutions to a series of key ATM problems (or inefficiencies) in the gate-to-gate operations of the current NAS. For each problem, one or more solutions were identified that could potentially solve the problem by utilizing distributed decision-making between the user (FD and/or AOC) and the ATSP. These solutions, known as concept elements (CEs), would potentially enable greater accommodation of user preferences and increased system capacity. A fundamental goal of the DAG-TM concept is the elimination of static restrictions, to the maximum extent possible. In this paradigm, users may plan and operate according to their preferences – as the rule rather than the exception – with deviations occurring only as dynamically necessary. Therefore, the DAG-TM concept elements were formulated to mitigate the extent and impact of dynamic NAS constraints, while maximizing the flexibility of airspace operations.
The DAG-TM Team first determined a comprehensive (albeit not exhaustive) list of problems/inefficiencies in the current ATM system, guided by a three-dimensional matrix that covered the entire regime of NAS operations. The first dimension spans the operational domains of Surface, Terminal Airspace and En route Airspace.. The second dimension spans the flight phases of Pre-Flight Planning, Departure, Cruise and Arrival. The third dimension spans the dynamic NAS constraints of Separation (traffic), Airspace (bad weather, SUA, congestion), and Transition (arrival metering/spacing); see Fig. 4-1. It is noted that many cells of the matrix cannot be populated; e.g., all cells involving the operational domain of Surface and the flight phase of Cruise. Numerous problems/inefficiencies in the operations of the current ATM system were identified, cataloged, and finally consolidated into a set of 10 key problems. These problems will be described later in Section 4.3.
　
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