DL 763 then UA 3756 at LAX
Atlanta → Los Angeles → Tucson
Timetable, Los Angeles time
19:55DL 763 from Atlanta at the gate
10:15UA 3756 to Tucson leaves the gate
14 h 20 apart on the timetable, overnight
UA 3756 leaves 14 h 20 after DL 763 arrives on the timetable: more than half a day, so not a connection we count.