AA 4454 then UA 769 at O'Hare
Indianapolis → Chicago → Barcelona
Timetable, Chicago time
06:00AA 4454 from Indianapolis at the gate
21:50UA 769 to Barcelona leaves the gate
15 h 50 apart on the timetable
UA 769 leaves 15 h 50 after AA 4454 arrives on the timetable: more than half a day, so not a connection we count.