DL 5238 then UA 3501 at Detroit
Greenville-Spartanburg → Detroit → Chicago O'Hare
Timetable, Detroit time
09:12DL 5238 from Greenville-Spartanburg at the gate
06:15UA 3501 to Chicago O'Hare leaves the gate
21 h 03 apart on the timetable, overnight
UA 3501 leaves 21 h 03 after DL 5238 arrives on the timetable: more than half a day, so not a connection we count.