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The Advanced Airspace Concept (Erzberger, 2001) proposes to achieve increased capacity in both en route and terminal areas through the use of technologies that include air-ground datalink, automation generating 4-D trajectories, and an independent back-up system, intended to provide safe transition whenever there is a malfunction. An analysis of the concept’s operations was performed using the human performance model Air Man Machine Integrated Design Analysis System (Air MIDAS) (Corker, 2000). For this research, three types of operations were modeled for an Air Traffic Control (ATC) agent – current operations, Automated Airspace Concept (AAC) operations, and Tactical Separation Assisted Flight Environment (T-SAFE) operations.. The results suggest that AAC operations decreased controller’s workload when compared with current day operations. However, transition of the aircraft from AAC through T-SAFE to standard ATM control increased workload for the period of transition. This was marked with a high level of activity for the ATC-agent under the current and T-SAFE operations as the ATC agent sought to update its internal world representation with relevant aircraft trajectories to assume manual control.