AA 9909 then AA 1366 at Denver
Los Angeles → Denver → Chicago O'Hare
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
14:27AA 1366 to Chicago O'Hare leaves the gate
21 h 42 apart on the timetable, overnight
AA 1366 leaves 21 h 42 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.