AA 9909 then UA 489 at Denver
Los Angeles → Denver → Houston
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
15:35UA 489 to Houston leaves the gate
22 h 50 apart on the timetable, overnight
UA 489 leaves 22 h 50 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.