AA 873 then UA 4645 at O'Hare
Atlanta → Chicago → Fort Wayne
Timetable, Chicago time
13:18AA 873 from Atlanta at the gate
11:25UA 4645 to Fort Wayne leaves the gate
22 h 07 apart on the timetable, overnight
UA 4645 leaves 22 h 07 after AA 873 arrives on the timetable: more than half a day, so not a connection we count.