AA 4912 then UA 5191 at O'Hare
Grand Rapids → Chicago → Lancaster
Timetable, Chicago time
16:22AA 4912 from Grand Rapids at the gate
08:50UA 5191 to Lancaster leaves the gate
16 h 28 apart on the timetable, overnight
UA 5191 leaves 16 h 28 after AA 4912 arrives on the timetable: more than half a day, so not a connection we count.