high A380/Trent 900 monitored noise levels.

Some QC examples

Subject to some limited carry-over provisions, when the airport's quota has been fully used up, no more night-time movements are allowed to take place. In practice, the airport spreads the quota so that it is used evenly across the season.

The quotas allocated to each airport operating the system are reduced periodically in order to achieve long-term reductions in the impact of night-time aircraft noise, the last such reduction having been in the Summer 2019

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