AA 4170 then UA 5191 at O'Hare
Oklahoma City → Chicago → Lancaster
Timetable, Chicago time
15:00AA 4170 from Oklahoma City at the gate
08:50UA 5191 to Lancaster leaves the gate
17 h 50 apart on the timetable, overnight
UA 5191 leaves 17 h 50 after AA 4170 arrives on the timetable: more than half a day, so not a connection we count.