UA 6008 then AA 3484 at O'Hare
Syracuse → Chicago → St Louis
Timetable, Chicago time
13:59UA 6008 from Syracuse at the gate
09:30AA 3484 to St Louis leaves the gate
19 h 31 apart on the timetable, overnight
AA 3484 leaves 19 h 31 after UA 6008 arrives on the timetable: more than half a day, so not a connection we count.