AA 2910 then UA 5191 at O'Hare
Atlanta → Chicago → Lancaster
Timetable, Chicago time
16:37AA 2910 from Atlanta at the gate
08:50UA 5191 to Lancaster leaves the gate
16 h 13 apart on the timetable, overnight
UA 5191 leaves 16 h 13 after AA 2910 arrives on the timetable: more than half a day, so not a connection we count.