QR 20 then AA 3544 at O'Hare
Doha → Chicago → Detroit
Timetable, Chicago time
13:42QR 20 from Doha at the gate
13:30AA 3544 to Detroit leaves the gate
23 h 48 apart on the timetable, overnight
AA 3544 leaves 23 h 48 after QR 20 arrives on the timetable: more than half a day, so not a connection we count.