instruction: which airline has more BUSINESS class flights than any other airline
response: SELECT DISTINCT COUNT(*), flight.airline_code FROM fare, fare_basis, flight, flight_fare WHERE fare_basis.class_type = 'BUSINESS' AND fare.fare_basis_code = fare_basis.fare_basis_code AND flight_fare.fare_id = fare.fare_id AND flight.flight_id = flight_fare.flight_id GROUP BY flight.airline_code