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Select airport airport_code , AVG(cder/31) flights_count from (Select distinct airport , sum(cdep) cder from (Select distinct departure_airport as airport, count(*) cdep from flights where actual_departure is not null and actual_departure>'20170801' group by departure_airport union all Select distinct arrival_airport , count(*) cdep from flights where actual_arrival is not null and actual_arrival>'20170801' group by arrival_airport) l group by airport) k group by airport having AVG(cder) <=3

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