OO 9908 then DL 1556 at O'Hare
Milwaukee → Chicago → Los Angeles
Timetable, Chicago time
07:46OO 9908 from Milwaukee at the gate
07:45DL 1556 to Los Angeles leaves the gate
23 h 59 apart on the timetable, overnight
DL 1556 leaves 23 h 59 after OO 9908 arrives on the timetable: more than half a day, so not a connection we count.