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Next, the DAG-TM Team identified one or more solutions to each of the 10 key ATM problems. It is noted that there are many potential ways to solve these problems, including technological and procedural changes that enhance the current ATM system without significantly changing its paradigm of operations (this approach has already been used to develop many of the innovative ATM DSTs and supporting technologies that are now coming online). However, in order to qualify as a DAG-TM concept element, the solution had to include a significant level of distributed decision-making between the user (FD and/or AOC) and the ATSP; this criterion for inclusion in the DAG-TM concept is, for lack of a better term, informally referred to by the team as “DAGgishness.” Using this approach, 14 concept elements were obtained as solutions to the 10 key ATM problems (four of the problems had two solutions). A common thread running through these concept elements was the requirement for information access/exchange. Therefore, gate-to-gate information access/exchange was considered to be a special concept element,
. Although oceanic and under-developed airspace were not explicitly included, DAG-TM activities will give due consideration to global interoperability issues.
in recognition of its pervasive nature. The resulting set of 15 concept elements establishes the framework of the DAG-TM Concept.
En route  En route Constraints 
(SUA, Wx, Congestion)  Arrival 
Metering 
En route -
Terminal Departure  Arrival  Terminal Arrival 
Surface Departure  Spacing  Surface Arrival 

En route
SUA
Congested Sector

Bad Weather Surface ArrivalSurface Departure
ATC Path Preferred Path
Terminal ArrivalTerminal Departure

Fig. 4-1: Representation of NAS Constraints

4.2 Outline of DAG-TM Concept Elements
Fig. 4-2 presents an overview of the 15 DAG-TM concept elements. As stated earlier, a special concept element for universal information access/exchange covers all ATM operations from gate to gate. This concept element is presented first, numbered “CE 0” to indicate its over-arching nature. The other concept elements are numbered “CE 1” through “CE 14.” It is noted that CEs 1 – 14 each represent a solution to a problem/inefficiency in the operations of the current NAS. Their sequence corresponds to the progression of a typical flight. The CE titles include a label that indicates the applicable operational domain and flight phase (e.g., Terminal Departure). The label “Gate-to-Gate” applies to all operational domains and all flight phases. Fig. 4-3 shows the relationship between CEs in the operational domain of En route Airspace.
CE Title
0 Gate-to-Gate: Information Access/Exchange for Enhanced Decision Support
1 Pre-Flight Planning: NAS-Constraint Considerations for Schedule/Flight Optimization
　
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