QR 47 then AA 3547 at O'Hare
Liege → Chicago → St Louis
Timetable, Chicago time
18:56QR 47 from Liege at the gate
16:50AA 3547 to St Louis leaves the gate
21 h 54 apart on the timetable, overnight
AA 3547 leaves 21 h 54 after QR 47 arrives on the timetable: more than half a day, so not a connection we count.