UA 5474 then AA 873 at O'Hare
Greenville-Spartanburg → Chicago → Atlanta
Timetable, Chicago time
07:36UA 5474 from Greenville-Spartanburg at the gate
07:17AA 873 to Atlanta leaves the gate
23 h 41 apart on the timetable, overnight
AA 873 leaves 23 h 41 after UA 5474 arrives on the timetable: more than half a day, so not a connection we count.