AA 3040 then DL 1556 at O'Hare
Atlanta → Chicago → Los Angeles
Timetable, Chicago time
08:33AA 3040 from Atlanta at the gate
07:45DL 1556 to Los Angeles leaves the gate
23 h 12 apart on the timetable, overnight
DL 1556 leaves 23 h 12 after AA 3040 arrives on the timetable: more than half a day, so not a connection we count.