EW 520 then UA 770 at Barcelona
Cologne → Barcelona → Chicago
Timetable, Barcelona time
16:50EW 520 from Cologne at the gate
15:10UA 770 to Chicago leaves the gatealso AC 4575, LH 8858
22 h 20 apart on the timetable, overnight
UA 770 leaves 22 h 20 after EW 520 arrives on the timetable: more than half a day, so not a connection we count.