UA 5100 then AA 3484 at O'Hare
Fort Dodge → Chicago → St Louis
Timetable, Chicago time
13:04UA 5100 from Fort Dodge at the gate
09:30AA 3484 to St Louis leaves the gate
20 h 26 apart on the timetable, overnight
AA 3484 leaves 20 h 26 after UA 5100 arrives on the timetable: more than half a day, so not a connection we count.