A method for predicting the trajectory of an aircraft is disclosed. It yields the arrival / departure times for a plurality of aircraft with respect to a specified system resource and is based upon specified data and other operational factors pertaining to the aircraft and system resource. This process comprises the steps of: (a) collecting and storing the specified data and operational factors, (b) processing, at an initial instant, the specified data that is applicable at that instant to the aircraft so as to predict an initial trajectory encompassing arrival / departure times for each aircraft, (c) upgrading these initial trajectory predictions for effects of: (1) environmental factors (weather, turbulence), (2) actions of the Air traffic Control system (e.g., stacking incoming aircraft when runway demand is greater than availability), and (3) secondary assets (e.g., crew availability / legality, gate availability, maintenance requirements), (d) communicating these trajectory predictions to interested parties and (e) continuously monitoring all trajectories, and, as necessary, updating the predictions.