G7 3375 then AA 3585 at O'Hare
St Louis → Chicago → Key West
Timetable, Chicago time
17:47G7 3375 from St Louis at the gate
12:10AA 3585 to Key West leaves the gate
18 h 23 apart on the timetable, overnight
AA 3585 leaves 18 h 23 after G7 3375 arrives on the timetable: more than half a day, so not a connection we count.