AA 2474 then UA 5191 at O'Hare
Phoenix → Chicago → Lancaster
Timetable, Chicago time
14:33AA 2474 from Phoenix at the gate
08:50UA 5191 to Lancaster leaves the gate
18 h 17 apart on the timetable, overnight
UA 5191 leaves 18 h 17 after AA 2474 arrives on the timetable: more than half a day, so not a connection we count.