A CDTI (Cockpit Display of Traffic Information) was developed for a trajectory-based operations concept for small aircraft. The CDTI presents not only the positions of other aircraft but also their trajectories, estimated CPA (Closest Point of Approach) in the case of a conflict, and other related information. Pilot acceptance of the CDTI was evaluated by flight simulation trials. Although traffic situational awareness was enhanced, the introduction of CDTI increased overall pilot workload.