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with t1 as(select distinct f.departure_airport as departure_airport,count(ticket_no) as cnt1 from flights f right join boarding_passes bp on f.flight_id=bp.flight_id where extract(year from actual_departure)=2017 and extract(month from actual_departure)=8 group by 1),t2 as(select distinct f.departure_airport as departure_airport,count(s.seat_no) as cnt2 from flights f right join seats s on f. aircraft_code=s.aircraft_code where extract(year from actual_departure)=2017 and extract(month from actual_departure)=8 group by 1) select t1.departure_airport,round(cnt1::numeric/cnt2*100,2) as average_flights_occupancy from t1 join t2 on t1.departure_airport=t2.departure_airport order by 1

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