AA 3380 then UA 3874 at O'Hare
Cleveland → Chicago → LCQ
Timetable, Chicago time
09:00AA 3380 from Cleveland at the gate
06:30UA 3874 to LCQ leaves the gate
21 h 30 apart on the timetable, overnight
UA 3874 leaves 21 h 30 after AA 3380 arrives on the timetable: more than half a day, so not a connection we count.