AA 4648 then UA 5191 at O'Hare
Grand Rapids → Chicago → Lancaster
Timetable, Chicago time
14:44AA 4648 from Grand Rapids at the gate
08:50UA 5191 to Lancaster leaves the gate
18 h 06 apart on the timetable, overnight
UA 5191 leaves 18 h 06 after AA 4648 arrives on the timetable: more than half a day, so not a connection we count.