AA 1424 then UA 3376 at O'Hare
Fort Lauderdale → Chicago → St Louis
Timetable, Chicago time
15:59AA 1424 from Fort Lauderdale at the gate
11:00UA 3376 to St Louis leaves the gate
19 h 01 apart on the timetable, overnight
UA 3376 leaves 19 h 01 after AA 1424 arrives on the timetable: more than half a day, so not a connection we count.