UA 3450 then AA 5875 at Charlotte
Chicago O'Hare → Charlotte → Greensboro
Timetable, Charlotte time
13:42UA 3450 from Chicago O'Hare at the gate
11:10AA 5875 to Greensboro leaves the gate
21 h 28 apart on the timetable, overnight
AA 5875 leaves 21 h 28 after UA 3450 arrives on the timetable: more than half a day, so not a connection we count.