UA 3565 then AA 3974 at O'Hare
Indianapolis → Chicago → Harrisburg
Timetable, Chicago time
09:36UA 3565 from Indianapolis at the gate
08:27AA 3974 to Harrisburg leaves the gate
22 h 51 apart on the timetable, overnight
AA 3974 leaves 22 h 51 after UA 3565 arrives on the timetable: more than half a day, so not a connection we count.