AA 9909 then UA 675 at Denver
Los Angeles → Denver → Chicago O'Hare
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
16:24UA 675 to Chicago O'Hare leaves the gate
23 h 39 apart on the timetable, overnight
UA 675 leaves 23 h 39 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.