S9 (Berlin)

S9 is a line on the Berlin S-Bahn. It operates from Schönefeld Flughafen to Pankow over:

A southern extension from Schönefeld station, serving the new Berlin Brandenburg International airport, is expected to open in 2018 or 2019. It will include two new stops: Waßmannsdorf and Berlin Brandenburg Airport (terminal).

...
Wikipedia