AA 6445 then UA 4772 at O'Hare
Kalamazoo → Chicago → Columbia Regional
Timetable, Chicago time
17:44AA 6445 from Kalamazoo at the gate
12:45UA 4772 to Columbia Regional leaves the gate
19 h 01 apart on the timetable, overnight
UA 4772 leaves 19 h 01 after AA 6445 arrives on the timetable: more than half a day, so not a connection we count.