AA 9782 then UA 3907 at O'Hare
Boston → Chicago → Cleveland
Timetable, Chicago time
13:14AA 9782 from Boston at the gate
07:30UA 3907 to Cleveland leaves the gate
18 h 16 apart on the timetable, overnight
UA 3907 leaves 18 h 16 after AA 9782 arrives on the timetable: more than half a day, so not a connection we count.