DL 1812 then UA 4749 at Detroit
Fort Lauderdale → Detroit → Chicago O'Hare
Timetable, Detroit time
14:46DL 1812 from Fort Lauderdale at the gate
10:48UA 4749 to Chicago O'Hare leaves the gate
20 h 02 apart on the timetable, overnight
UA 4749 leaves 20 h 02 after DL 1812 arrives on the timetable: more than half a day, so not a connection we count.