AA 9950 then DL 1556 at O'Hare
Charlotte → Chicago → Los Angeles
Timetable, Chicago time
08:30AA 9950 from Charlotte at the gate
07:45DL 1556 to Los Angeles leaves the gate
23 h 15 apart on the timetable, overnight
DL 1556 leaves 23 h 15 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.