DL 996 then UA 580 at LAX
Atlanta → Los Angeles → Houston
Timetable, Los Angeles time
08:59DL 996 from Atlanta at the gate
23:59UA 580 to Houston leaves the gate
15 h apart on the timetable
UA 580 leaves 15 h after DL 996 arrives on the timetable: more than half a day, so not a connection we count.