WITH a AS 
(
	SELECT 'ABA' AS arrival_airport, 'АБАКАН' AS "name", 'Business' AS fare_condidtion, 15.00 AS Amount UNION ALL 
	SELECT 'ABA' AS arrival_airport, 'АБАКАН' AS "name", 'Economy' AS fare_condidtion, 11.00 AS Amount UNION ALL 
	SELECT 'ABA' AS arrival_airport, 'АБАКАН' AS "name", 'Economy' AS fare_condidtion, 12.00 AS Amount UNION ALL 
	SELECT 'ABA' AS arrival_airport, 'АБАКАН' AS "name", 'Economy' AS fare_condidtion, 13.00 AS Amount UNION ALL
	SELECT 'AER' AS arrival_airport, 'СОЧИ' AS "name", 'Economy' AS fare_condidtion, 10.00 AS Amount UNION ALL 
	SELECT 'AER' AS arrival_airport, 'СОЧИ' AS "name", 'Economy' AS fare_condidtion, 11.00 AS Amount UNION ALL 
	SELECT 'AER' AS arrival_airport, 'СОЧИ' AS "name", 'Business' AS fare_condidtion, 12.00 AS Amount UNION ALL 
	SELECT 'AER' AS arrival_airport, 'СОЧИ' AS "name", 'Economy' AS fare_condidtion, 13.00 AS Amount
) 
SELECT 
	arrival_airport 
FROM 
	a
GROUP BY arrival_airport
HAVING 
	MIN(Amount) FILTER (WHERE fare_condidtion = 'Business') < 
	MAX(Amount) FILTER (WHERE fare_condidtion = 'Economy');