DL 2790 then UA 4749 at Detroit
New Orleans → Detroit → Chicago O'Hare
Timetable, Detroit time
14:49DL 2790 from New Orleans at the gate
10:48UA 4749 to Chicago O'Hare leaves the gate
19 h 59 apart on the timetable, overnight
UA 4749 leaves 19 h 59 after DL 2790 arrives on the timetable: more than half a day, so not a connection we count.