AA 764 then UA 5191 at O'Hare
Houston → Chicago → Lancaster
Timetable, Chicago time
11:58AA 764 from Houston at the gate
08:50UA 5191 to Lancaster leaves the gate
20 h 52 apart on the timetable, overnight
UA 5191 leaves 20 h 52 after AA 764 arrives on the timetable: more than half a day, so not a connection we count.