DL 763 then UA 2146 at LAX
Atlanta → Los Angeles → Denver
Timetable, Los Angeles time
19:55DL 763 from Atlanta at the gate
16:17UA 2146 to Denver leaves the gate
20 h 22 apart on the timetable, overnight
UA 2146 leaves 20 h 22 after DL 763 arrives on the timetable: more than half a day, so not a connection we count.