AA 642 then UA 3645 at O'Hare
Dallas-Fort Worth → Chicago → Cleveland
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
13:00UA 3645 to Cleveland leaves the gate
23 h 50 apart on the timetable, overnight
UA 3645 leaves 23 h 50 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.