AA 4557 then UA 5201 at O'Hare
Indianapolis → Chicago → Milwaukee
Timetable, Chicago time
07:11AA 4557 from Indianapolis at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 49 apart on the timetable
UA 5201 leaves 12 h 49 after AA 4557 arrives on the timetable: more than half a day, so not a connection we count.