AA 9950 then UA 1360 at O'Hare
Charlotte → Chicago → Nashville
Timetable, Chicago time
08:30AA 9950 from Charlotte at the gate
21:20UA 1360 to Nashville leaves the gate
12 h 50 apart on the timetable
UA 1360 leaves 12 h 50 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.