AA 337 then UA 3907 at O'Hare
Dallas-Fort Worth → Chicago → Cleveland
Timetable, Chicago time
12:08AA 337 from Dallas-Fort Worth at the gate
07:30UA 3907 to Cleveland leaves the gate
19 h 22 apart on the timetable, overnight
UA 3907 leaves 19 h 22 after AA 337 arrives on the timetable: more than half a day, so not a connection we count.