AA 3588 then UA 5191 at O'Hare
Little Rock → Chicago → Lancaster
Timetable, Chicago time
14:23AA 3588 from Little Rock at the gate
08:50UA 5191 to Lancaster leaves the gate
18 h 27 apart on the timetable, overnight
UA 5191 leaves 18 h 27 after AA 3588 arrives on the timetable: more than half a day, so not a connection we count.