AA 5345 then AA 818 at Charlotte
Huntsville → Charlotte → Chicago O'Hare
Timetable, Charlotte time
11:20AA 5345 from Huntsville at the gate
11:02AA 818 to Chicago O'Hare leaves the gate
23 h 42 apart on the timetable, overnight
AA 818 leaves 23 h 42 after AA 5345 arrives on the timetable: more than half a day, so not a connection we count.