DL 501 then UA 457 at LAX
Atlanta → Los Angeles → Chicago O'Hare
Timetable, Los Angeles time
12:44DL 501 from Atlanta at the gate
12:40UA 457 to Chicago O'Hare leaves the gate
23 h 56 apart on the timetable, overnight
UA 457 leaves 23 h 56 after DL 501 arrives on the timetable: more than half a day, so not a connection we count.