AA 9866 then DL 1556 at O'Hare
Bloomington-Normal → Chicago → Los Angeles
Timetable, Chicago time
13:11AA 9866 from Bloomington-Normal at the gate
07:45DL 1556 to Los Angeles leaves the gate
18 h 34 apart on the timetable, overnight
DL 1556 leaves 18 h 34 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.