AA 4643 then UA 5191 at O'Hare
Norfolk → Chicago → Lancaster
Timetable, Chicago time
13:52AA 4643 from Norfolk at the gate
08:50UA 5191 to Lancaster leaves the gate
18 h 58 apart on the timetable, overnight
UA 5191 leaves 18 h 58 after AA 4643 arrives on the timetable: more than half a day, so not a connection we count.