AA 4454 then UA 5539 at O'Hare
Indianapolis → Chicago → Moline
Timetable, Chicago time
06:00AA 4454 from Indianapolis at the gate
21:47UA 5539 to Moline leaves the gate
15 h 47 apart on the timetable
UA 5539 leaves 15 h 47 after AA 4454 arrives on the timetable: more than half a day, so not a connection we count.