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It is expected that, with increasing automation, the emphasis in the air traffic controllers’ work will shift from tactical control towards supervision and planning of aircraft trajectories. To support this work, a planning interface for area controllers has been developed. The interface uses a normal Plan View Display (PVD) supplemented with a Time-Space Diagram (TSD), that visualizes the travel of the incoming aircraft across their planned track. With the constraints on speed and timing as given in the TSD, the interface permits direct manipulation of the arrival time within these constraints. Using a simulation of air traffic, the interface was tested in an experiment. The results indicate that the interface can be used to manage traffic efficiently, but that maintaining a coherent mental picture using both the TSD and the PVD is still difficult.