AA 9909 then UA 1715 at Denver
Los Angeles → Denver → Newark
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
16:12UA 1715 to Newark leaves the gate
23 h 27 apart on the timetable, overnight
UA 1715 leaves 23 h 27 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.