Abstract: A system for detecting aircraft trajectory anomalies during takeoff or landing is configured to: identify, from a clearance message directed to a first aircraft, an approved runway and an approved landing or takeoff procedure; select a runway-specific trained model appropriate for the approved procedure, the selected trained model having been trained with historical track data from other aircraft performing the approved procedure in connection with the approved runway, the selected trained model configured to provide an expected trajectory for an aircraft during performance of the approved procedure in connection with the approved runway; receive aircraft state information from the first aircraft during performance of the approved procedure; monitor and compare the received aircraft state information to the expected trajectory from the trained model; identify an anomaly and generate an alert when the trajectory of the first aircraft deviates from the expected trajectory by more than a predetermined threshold