DL 4001 then UA 2780 at LAX
San Diego → Los Angeles → Chicago O'Hare
Timetable, Los Angeles time
17:01DL 4001 from San Diego at the gate
16:48UA 2780 to Chicago O'Hare leaves the gate
23 h 47 apart on the timetable, overnight
UA 2780 leaves 23 h 47 after DL 4001 arrives on the timetable: more than half a day, so not a connection we count.