UA 423 then TK 134 at Houston
Philadelphia → Houston → Istanbul
Timetable, Houston time
15:29UA 423 from Philadelphia at the gate
15:05TK 134 to Istanbul leaves the gate
23 h 36 apart on the timetable, overnight
TK 134 leaves 23 h 36 after UA 423 arrives on the timetable: more than half a day, so not a connection we count.