AA 4489 then UA 5191 at O'Hare
Savannah → Chicago → Lancaster
Timetable, Chicago time
13:43AA 4489 from Savannah at the gate
08:50UA 5191 to Lancaster leaves the gate
19 h 07 apart on the timetable, overnight
UA 5191 leaves 19 h 07 after AA 4489 arrives on the timetable: more than half a day, so not a connection we count.