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with s_flight as (select distinct departure_airport, arrival_airport from flights where departure_airport = 'LED' or arrival_airport = 'BZK') select sf.departure_airport, sf.arrival_airport as connection_airport, f.arrival_airport from s_flight af left join flights f on sf.arrival_airport = f.departure_airport where sf.departure_airport = 'LED' and f.arrival_airport = 'BZK' order by connection_airport

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