TK 861 then SQ 391 at Istanbul
Muscat → Istanbul → Singapore
Timetable, Istanbul time
13:30TK 861 from Muscat at the gate
13:15SQ 391 to Singapore leaves the gate
23 h 45 apart on the timetable, overnight
SQ 391 leaves 23 h 45 after TK 861 arrives on the timetable: more than half a day, so not a connection we count.