QR 47 then AA 6487 at O'Hare
Liege → Chicago → St Louis
Timetable, Chicago time
18:56QR 47 from Liege at the gate
15:18AA 6487 to St Louis leaves the gate
20 h 22 apart on the timetable, overnight
AA 6487 leaves 20 h 22 after QR 47 arrives on the timetable: more than half a day, so not a connection we count.