DL 1145 then UA 4749 at Detroit
Myrtle Beach → Detroit → Chicago O'Hare
Timetable, Detroit time
13:30DL 1145 from Myrtle Beach at the gate
10:48UA 4749 to Chicago O'Hare leaves the gate
21 h 18 apart on the timetable, overnight
UA 4749 leaves 21 h 18 after DL 1145 arrives on the timetable: more than half a day, so not a connection we count.