UA 3504 then DL 3875 at Detroit
Washington → Detroit → Columbus (Ohio)
Timetable, Detroit time
14:19UA 3504 from Washington at the gate
14:10DL 3875 to Columbus (Ohio) leaves the gate
23 h 51 apart on the timetable, overnight
DL 3875 leaves 23 h 51 after UA 3504 arrives on the timetable: more than half a day, so not a connection we count.