During approach to an airport aircraft as noise sources change along the approach paths they travel. Extension of slats, flaps and landing gear will affect aerodynamic noise and as a consequence of increased drag also engine noise will be affected. In the ERAS-project the overall possibilities at an airport to reduce noise by implementing operational procedures for arriving aircraft is evaluated. As a first step a number of aircraft types were selected and the operational descriptions in the Aircraft Noise and Performance database (ANP), maintained by Eurocontrol were compared to the operational descriptions in the aircrafts' operating manuals (FCOM). One aircraft type where discrepancies was found between the ANP and the FCOM and where flight data from real flights were available was selected for further analysis. Flight data recorder data from 1 357 flights were analyzed in order to find operational possibilities and limitations. Based on the outcome from actual flights and the FCOM, twelve operationally feasible approach scenarios were developed in which noise and fuel calculations were performed for the developed scenarios. The results suggest that there exists possibilities for airports to reduce both noise and CO2 emissions by implementing operational recommendations for landing aircraft.