AA 4933 then UA 5191 at O'Hare
Des Moines → Chicago → Lancaster
Timetable, Chicago time
15:39AA 4933 from Des Moines at the gate
08:50UA 5191 to Lancaster leaves the gate
17 h 11 apart on the timetable, overnight
UA 5191 leaves 17 h 11 after AA 4933 arrives on the timetable: more than half a day, so not a connection we count.