Question: Sabiha Gökçen International Airport serves as the hub for what airline headquartered in the Kurtköy area of Pendik, Istanbul?
Sentence (from "Sabiha Gökçen International Airport"): Sabiha Gökçen International Airport (IATA: SAW, ICAO: LTFJ) is one of the two international airports serving Istanbul, the largest city in Turkey, the other being Atatürk Airport.
Relevant evidence: No