QR 3743 then AA 41 at Barcelona
Milan → Barcelona → Chicago
Timetable, Barcelona time
14:55QR 3743 from Milan at the gate
11:30AA 41 to Chicago leaves the gatealso BA 1552, AY 3829, IB 4383
20 h 35 apart on the timetable, overnight
AA 41 leaves 20 h 35 after QR 3743 arrives on the timetable: more than half a day, so not a connection we count.