SELECT COUNT(*) FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T2.Airline = T1.uid WHERE T1.Airline = "United Airlines" AND T2.SourceAirport = "AHD"
Berapa banyak penerbangan 'United Airlines' yang berangkat dari bandara 'ahd'?
CREATE TABLE FLIGHTS (Airline VARCHAR, SourceAirport VARCHAR); CREATE TABLE AIRLINES (uid VARCHAR, Airline VARCHAR)