AA 9909 then UA 1337 at Denver
Los Angeles → Denver → Portland (Oregon)
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
16:15UA 1337 to Portland (Oregon) leaves the gate
23 h 30 apart on the timetable, overnight
UA 1337 leaves 23 h 30 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.