Double-checking some dates and details from the last post sent Timetablist to this website, with a treasure-trove of Interfluginalia, including this gracefully fluid route map, as the East German state carrier gently jets across the Second and Third Worlds.
The Warsaw pact capitals are well represented, such as Warsaw itself, but also including the smaller cities such as Tirana and Zagreb. Past the Iron Curtain, some non-aligned and socialist states of the Arab world are served, such as the Nicosia-Damascus-Baghdad route and the Cairo-Khartoum connection. The dashed lines and double-M metro sign perhaps indicate regional rail connections; secondary airports of the DDR, namely Dresden and Erfurt, are connected to Budapest, from whence it appears, reading the threading of the route lines correctly, that flights continue onward on the famous Algiers-Bamako-Conakry-Freetown journey. Almost everything else is out of Schönefeld.