UA 4671 then DL 1634 at LAX
Reno → Los Angeles → Chicago O'Hare
Timetable, Los Angeles time
17:29UA 4671 from Reno at the gate
15:00DL 1634 to Chicago O'Hare leaves the gate
21 h 31 apart on the timetable, overnight
DL 1634 leaves 21 h 31 after UA 4671 arrives on the timetable: more than half a day, so not a connection we count.