AA 928 then UA 3376 at O'Hare
Miami → Chicago → St Louis
Timetable, Chicago time
19:49AA 928 from Miami at the gate
11:00UA 3376 to St Louis leaves the gate
15 h 11 apart on the timetable, overnight
UA 3376 leaves 15 h 11 after AA 928 arrives on the timetable: more than half a day, so not a connection we count.