UA 3499 then AA 1642 at Charlotte
Chicago O'Hare → Charlotte → Greenville-Spartanburg
Timetable, Charlotte time
17:12UA 3499 from Chicago O'Hare at the gate
14:30AA 1642 to Greenville-Spartanburg leaves the gate
21 h 18 apart on the timetable, overnight
AA 1642 leaves 21 h 18 after UA 3499 arrives on the timetable: more than half a day, so not a connection we count.