AA 9909 then UA 1129 at Denver
Los Angeles → Denver → Santa Ana
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
15:58UA 1129 to Santa Ana leaves the gate
23 h 13 apart on the timetable, overnight
UA 1129 leaves 23 h 13 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.