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DMAN, also known as Departure Manager is a planning tool developed to improve the departure flows at airports and increase the predictability. DMAN calculates the Target Take Off Times (TTOT) and the Target Startup Approval Times (TSAT) taking multiple constraints and preferences into account. As a result the DMAN provides a planned departure flow with the goal to maintain an optimal throughput at the runway, reduce queuing at holding point and distribute the information to various stakeholders at the airport (i.e. the airline, ground handling and Air Traffic Control (ATC)). EUROCONTROL have defined DMAN as follows:
"DMAN is a planning system to improve departure flows at airports by calculating the Target Take Off Time (TTOT) and Target Start-up Approval Time (TSAT) for each flight, taking multiple constraints and preferences into account."