Task: Text to Code
Input (English): SQL: SELECT T1.AirportCode FROM airports AS T1 JOIN flights AS T2 ON T1.AirportCode = T2.SourceAirport ORDER BY T2.FlightNo Desc LIMIT 1
Feedback: airport code should be present most number of times as source airport or destination airport in flights .
Output (English): SELECT T1.AirportCode FROM AIRPORTS AS T1 JOIN FLIGHTS AS T2 ON T1.AirportCode  =  T2.DestAirport OR T1.AirportCode  =  T2.SourceAirport GROUP BY T1.AirportCode ORDER BY count(*) DESC LIMIT 1