AA 4448 then DL 1556 at O'Hare
Memphis → Chicago → Los Angeles
Timetable, Chicago time
08:47AA 4448 from Memphis at the gate
07:45DL 1556 to Los Angeles leaves the gate
22 h 58 apart on the timetable, overnight
DL 1556 leaves 22 h 58 after AA 4448 arrives on the timetable: more than half a day, so not a connection we count.