An Action Plan has been drawn up to monitor the impacts of the measures. The impacts are calculated for the entire 2026 operating year, as the measures may not yet have reached their full potential by 1 November 2025, and because the impacts may vary between the summer and winter seasons. During the operating year, the impacts will be assessed at three moments in time – 1 November 2025, 1 April 2026 and 1 November 2026 – to assess whether the measures are having the intended impacts. The results of the first two measurement points are partly based on forecasts. At the third and final measurement point, all actual data for the 2026 operational year will be available and the impacts can be definitively determined.

• Measurement point 1: The noise targets for the night were comfortably met at measurement point 1, but the noise targets for the entire 24-hour period were not. The measure airport charges differentiation had a greater impact than previously expected, as airlines deployed more quiet aircraft. However, the measures relating to additional fleet renewal, KLM’s night-time optimisation and the ban on noisy aircraft at night had a smaller impact than expected. This can be explained, respectively, by the delayed fleet renewal at KLM and Transavia, limited shift of quiet KLM aircraft between day and night, and the fact that fewer noisy aircraft have been taken out of night-time operations. As noted above, the results for measurement point 1 are still partly based on forecasts. In addition, the effect of airport charges differentiation is likely still underestimated, due to a lack of information on the latest aircraft types. This information will be available at measurement point 2.