Distributed Air Ground Traffic Management (DAG-TM)
The Distributed Air/Ground Traffic Management (DAG-TM) concept is a coherent set of conceptual elements that describes possible modes of operation within the outlines of the Free Flight concept defined by the RTCA Task Force. It was originally conceived as one possible approach to the potential implementation of Free Flight, progressing along the path started by the Free Flight Phase 1 activities. This DAG-TM concept was developed by the Advanced Air Transportation Technologies (AATT) Project.
Distributed Air/Ground Traffic Management is a National Airspace System concept in which flight deck (FD) crews, air traffic service providers (ATSP) and aeronautical operational control (AOC) facilities used distributed decision-making to enable user preferences and increase system capacity, while meeting air traffic management requirements. DAG-TM was originally created with a human-centered operational paradigm enabled by procedural and technological innovations. These innovations included automation aids, information sharing and Communication, Navigation, and Surveillance (CNS) / Air Traffic Management (ATM) technologies.
DAG-TM was proposed for gate-to-gate NAS operations beyond the year 2015. It addressed dynamic NAS constraints such as bad weather, Special Use Airspace (SUA) and arrival metering/spacing. The goal of DAG-TM was to enhance user flexibility/efficiency and increase system capacity, without adversely affecting system safety or restricting user accessibility to the NAS. The DAG-TM concept was intended to address all user classes (commercial carriers, general aviation, etc.) with an emphasis towards ensuring access to airspace resources for the entire user community. It covered all flight phases (Pre-Flight Planning, Departure, Cruise and Arrival) and operational domains in the NAS (Surface, Terminal Airspace and En route Airspace). Although other operational domains (e.g., European, oceanic, and under-developed airspace) were outside the scope of the DAG-TM concept, consideration was always given to global interoperability issues.
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