Question: How many United Airlines flights go to City 'Aberdeen'?
SQL: SELECT count(*) FROM FLIGHTS AS T1 JOIN AIRPORTS AS T2 ON T1.DestAirport  =  T2.AirportCode JOIN AIRLINES AS T3 ON T3.uid  =  T1.Airline WHERE T2.City  =  "Aberdeen" AND T3.Airline  =  "United Airlines"