AA 3798 then UA 4645 at O'Hare
Mosinee → Chicago → Fort Wayne
Timetable, Chicago time
13:17AA 3798 from Mosinee at the gate
11:25UA 4645 to Fort Wayne leaves the gate
22 h 08 apart on the timetable, overnight
UA 4645 leaves 22 h 08 after AA 3798 arrives on the timetable: more than half a day, so not a connection we count.