AA 4498 then UA 4645 at O'Hare
Harrisburg → Chicago → Fort Wayne
Timetable, Chicago time
16:43AA 4498 from Harrisburg at the gate
11:25UA 4645 to Fort Wayne leaves the gate
18 h 42 apart on the timetable, overnight
UA 4645 leaves 18 h 42 after AA 4498 arrives on the timetable: more than half a day, so not a connection we count.