UA 474 then QR 76 at O'Hare
Mexico City → Chicago → Milan
Timetable, Chicago time
19:34UA 474 from Mexico City at the gate
14:45QR 76 to Milan leaves the gate
19 h 11 apart on the timetable, overnight
QR 76 leaves 19 h 11 after UA 474 arrives on the timetable: more than half a day, so not a connection we count.