UA 3909 then TK 80 at San Francisco
Chicago O'Hare → San Francisco → Istanbul
Timetable, San Francisco time
22:20UA 3909 from Chicago O'Hare at the gate
18:35TK 80 to Istanbul leaves the gate
20 h 15 apart on the timetable, overnight
TK 80 leaves 20 h 15 after UA 3909 arrives on the timetable: more than half a day, so not a connection we count.