AA 2124 then UA 2758 at LAX
Chicago O'Hare → Los Angeles → Cleveland
Timetable, Los Angeles time
10:44AA 2124 from Chicago O'Hare at the gate
23:10UA 2758 to Cleveland leaves the gate
12 h 26 apart on the timetable
UA 2758 leaves 12 h 26 after AA 2124 arrives on the timetable: more than half a day, so not a connection we count.