AA 1672 then UA 5191 at O'Hare
Harrisburg → Chicago → Lancaster
Timetable, Chicago time
13:29AA 1672 from Harrisburg at the gate
08:50UA 5191 to Lancaster leaves the gate
19 h 21 apart on the timetable, overnight
UA 5191 leaves 19 h 21 after AA 1672 arrives on the timetable: more than half a day, so not a connection we count.