AA 4541 then UA 4645 at O'Hare
Indianapolis → Chicago → Fort Wayne
Timetable, Chicago time
16:00AA 4541 from Indianapolis at the gate
11:25UA 4645 to Fort Wayne leaves the gate
19 h 25 apart on the timetable, overnight
UA 4645 leaves 19 h 25 after AA 4541 arrives on the timetable: more than half a day, so not a connection we count.