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Aircraft noise is considered to be one of the most difficult environmental problems to be mitigated from the airport operations. The ICAO study group has presented an approach with four proposals to manage this problem at each site – the “Guidance on the Balanced Approach to Aircraft Noise Management” –, but even with this document, the airport managers still have to do their plan of action to address the most problematic ones (cases where there is more than one airport under the same administration). In this way, this paper attempts to propose a methodology to help to identify what would be the equivalent aircraft movement in a month for each site. The hypothesis is that this indicator number will express how close the airport operation is to the Balanced Approach proposals. And to calculate it, this methodology uses the number of movements identified by Chapter 2 or Chapter 3 and by day or night for a given period.