AA 9928 then UA 5539 at O'Hare
New York LaGuardia → Chicago → Moline
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
21:47UA 5539 to Moline leaves the gate
15 h 02 apart on the timetable
UA 5539 leaves 15 h 02 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.