AA 2437 then UA 2771 at Charlotte
Pittsburgh → Charlotte → Chicago O'Hare
Timetable, Charlotte time
09:17AA 2437 from Pittsburgh at the gate
08:10UA 2771 to Chicago O'Hare leaves the gate
22 h 53 apart on the timetable, overnight
UA 2771 leaves 22 h 53 after AA 2437 arrives on the timetable: more than half a day, so not a connection we count.