AA 6486 then UA 3645 at O'Hare
Detroit → Chicago → Kansas City
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
12:40UA 3645 to Kansas City leaves the gate
19 h 11 apart on the timetable, overnight
UA 3645 leaves 19 h 11 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.