OO 9908 then UA 5201 at O'Hare
Milwaukee → Chicago → Milwaukee
Timetable, Chicago time
07:46OO 9908 from Milwaukee at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 14 apart on the timetable
UA 5201 leaves 12 h 14 after OO 9908 arrives on the timetable: more than half a day, so not a connection we count.