AA 6279 then UA 3376 at O'Hare
Kalamazoo → Chicago → St Louis
Timetable, Chicago time
18:11AA 6279 from Kalamazoo at the gate
11:00UA 3376 to St Louis leaves the gate
16 h 49 apart on the timetable, overnight
UA 3376 leaves 16 h 49 after AA 6279 arrives on the timetable: more than half a day, so not a connection we count.