AA 4751 then DL 1556 at O'Hare
Knoxville → Chicago → Los Angeles
Timetable, Chicago time
08:39AA 4751 from Knoxville at the gate
07:45DL 1556 to Los Angeles leaves the gate
23 h 06 apart on the timetable, overnight
DL 1556 leaves 23 h 06 after AA 4751 arrives on the timetable: more than half a day, so not a connection we count.