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select date_trunc('minute',avg(f.delay)) as average_departure_delay, max(f.delay) as maximal_departure_delay from (select scheduled_departure, actual_departure, actual_departure - scheduled_departure as delay from flights where departure_airport = 'DME' and actual_departure::date between '2017-08-01' AND '2017-08-31' and actual_departure is not null) f

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