AA 873 then DL 575 at Atlanta
Chicago O'Hare → Atlanta → Los Angeles
Timetable, Atlanta time
10:23AA 873 from Chicago O'Hare at the gate
22:55DL 575 to Los Angeles leaves the gate
12 h 32 apart on the timetable
DL 575 leaves 12 h 32 after AA 873 arrives on the timetable: more than half a day, so not a connection we count.