AA 808 then UA 3907 at O'Hare
Washington National → Chicago → Cleveland
Timetable, Chicago time
14:29AA 808 from Washington National at the gate
07:30UA 3907 to Cleveland leaves the gate
17 h 01 apart on the timetable, overnight
UA 3907 leaves 17 h 01 after AA 808 arrives on the timetable: more than half a day, so not a connection we count.