AA 642 then UA 1548 at O'Hare
Dallas-Fort Worth → Chicago → Cleveland
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
10:45UA 1548 to Cleveland leaves the gate
21 h 35 apart on the timetable, overnight
UA 1548 leaves 21 h 35 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.