Kadıköy - Sabiha Gökçen Havalimanı
Subway route
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The M4, officially referred to as the M4 Kadıköy - Sabiha Gökçen Airport metro line, is a 33.5-kilometre, 23-station rapid transit line of the Istanbul Metro. It is colored deep pink on the maps and route signs. Wikipedia
Stations: 23
Opened: August 17, 2012