AA 3486 then UA 4645 at O'Hare
Jacksonville → Chicago → Fort Wayne
Timetable, Chicago time
14:20AA 3486 from Jacksonville at the gate
11:25UA 4645 to Fort Wayne leaves the gate
21 h 05 apart on the timetable, overnight
UA 4645 leaves 21 h 05 after AA 3486 arrives on the timetable: more than half a day, so not a connection we count.