UA 3421 then AA 5564 at Charlotte
Newark → Charlotte → Harrisburg
Timetable, Charlotte time
11:39UA 3421 from Newark at the gate
11:15AA 5564 to Harrisburg leaves the gate
23 h 36 apart on the timetable, overnight
AA 5564 leaves 23 h 36 after UA 3421 arrives on the timetable: more than half a day, so not a connection we count.