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... For each aircraft type, the fleet exposure level was calculated using the formula below, after determining the number of air transport movements (atms) required by each type of aircraft to transport a certain volume of passengers. The formula used was: Where L fleet is the fleet noise exposure; n cat is the number of aircraft movements (including time-of-day weightings, which here is not accounted for) for an aircraft type (here, only one aircraft type is assumed in each calculation); and L ave is the average of the three noise certification levels for an aircraft type (Busink, 2001). Rewriting the above formula and assuming n flights of one aircraft type for each calculation yields: L fleet = L ave +10log (n). ...