QR 47 then AA 2202 at O'Hare
Liege → Chicago → Buffalo
Timetable, Chicago time
18:56QR 47 from Liege at the gate
15:19AA 2202 to Buffalo leaves the gate
20 h 23 apart on the timetable, overnight
AA 2202 leaves 20 h 23 after QR 47 arrives on the timetable: more than half a day, so not a connection we count.