BA 1524 then EC 7151 at Barcelona
Chicago → Barcelona → Milan
Timetable, Barcelona time
09:50BA 1524 from Chicago at the gatealso AY 3828, IB 4382
07:30EC 7151 to Milan leaves the gate
21 h 40 apart on the timetable, overnight
EC 7151 leaves 21 h 40 after BA 1524 arrives on the timetable: more than half a day, so not a connection we count.