UA 4387 then TK 8 at Dulles
Burlington → Washington → Istanbul
Timetable, Washington time
21:26UA 4387 from Burlington at the gate
21:20TK 8 to Istanbul leaves the gate
23 h 54 apart on the timetable, overnight
TK 8 leaves 23 h 54 after UA 4387 arrives on the timetable: more than half a day, so not a connection we count.