AA 1998 then UA 5539 at O'Hare
Los Angeles → Chicago → Cleveland
Timetable, Chicago time
20:00AA 1998 from Los Angeles at the gate
10:45UA 5539 to Cleveland leaves the gate
14 h 45 apart on the timetable, overnight
UA 5539 leaves 14 h 45 after AA 1998 arrives on the timetable: more than half a day, so not a connection we count.