UA 5192 then AA 4494 at O'Hare
Jacksonville → Chicago → Harrisburg
Timetable, Chicago time
17:30UA 5192 from Jacksonville at the gate
16:20AA 4494 to Harrisburg leaves the gate
22 h 50 apart on the timetable, overnight
AA 4494 leaves 22 h 50 after UA 5192 arrives on the timetable: more than half a day, so not a connection we count.