TK 6037 then UA 2458 at O'Hare
Istanbul → Chicago → Denver
Timetable, Chicago time
05:05TK 6037 from Istanbul at the gate
17:48UA 2458 to Denver leaves the gate
12 h 43 apart on the timetable
UA 2458 leaves 12 h 43 after TK 6037 arrives on the timetable: more than half a day, so not a connection we count.