AA 642 then QR 8155 at O'Hare
Dallas-Fort Worth → Chicago → Milan
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
10:10QR 8155 to Milan leaves the gate
21 h apart on the timetable, overnight
QR 8155 leaves 21 h after AA 642 arrives on the timetable: more than half a day, so not a connection we count.