UA 1915 then DL 5446 at Detroit
Denver → Detroit → Cincinnati
Timetable, Detroit time
14:27UA 1915 from Denver at the gate
14:00DL 5446 to Cincinnati leaves the gate
23 h 33 apart on the timetable, overnight
DL 5446 leaves 23 h 33 after UA 1915 arrives on the timetable: more than half a day, so not a connection we count.