AA 1757 then UA 3442 at Charlotte
Milwaukee → Charlotte → Chicago O'Hare
Timetable, Charlotte time
21:34AA 1757 from Milwaukee at the gate
12:37UA 3442 to Chicago O'Hare leaves the gate
15 h 03 apart on the timetable, overnight
UA 3442 leaves 15 h 03 after AA 1757 arrives on the timetable: more than half a day, so not a connection we count.