The European research project DYNCAT is investigating the interactions of the various factors influencing the approach phase. 640 approaches to Zurich Airport are being comprehensively evaluated for this purpose. In addition to weather conditions, the local conditions at the airport, the state of the aircraft and the traffic density, the requirements of air traffic control and the noise impact on the ground are also being taken into account. The goal is to use the acquired data to develop an operational concept that supports pilots and air traffic controllers in implementing fuel-efficient and low-noise approaches.