AA 9867 then UA 4645 at O'Hare
Marquette → Chicago → Fort Wayne
Timetable, Chicago time
13:05AA 9867 from Marquette at the gate
11:25UA 4645 to Fort Wayne leaves the gate
22 h 20 apart on the timetable, overnight
UA 4645 leaves 22 h 20 after AA 9867 arrives on the timetable: more than half a day, so not a connection we count.