Task: Text to Code
Input (English): SQL: SELECT DestAirport FROM flights GROUP BY DestAirport ORDER BY Count ( * ) Asc LIMIT 1
Feedback: in step 1 and 2, use airport code instead of destination airport.
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(*) LIMIT 1