Line Route Length Stations Notes[27] Bakırköy-İDO ↔ Kirazlı 9.0 km (under construction) 7 (under construction) Line under construction, opening: 2019. Tavşantepe ↔ Sabiha Gökçen Airport 7.4 km (under construction) 4 (under construction) Line under construction, opening: 2018. Yamanevler ↔ Çekmeköy–Sancaktepe 9.5 km[39] (under construction) 7 (under construction) Line under construction, opening: 2018.