AA 4103 then UA 3874 at O'Hare
Detroit → Chicago → LCQ
Timetable, Chicago time
11:00AA 4103 from Detroit at the gate
06:30UA 3874 to LCQ leaves the gate
19 h 30 apart on the timetable, overnight
UA 3874 leaves 19 h 30 after AA 4103 arrives on the timetable: more than half a day, so not a connection we count.