AA 4912 then UA 3018 at O'Hare
Grand Rapids → Chicago → Newark
Timetable, Chicago time
16:22AA 4912 from Grand Rapids at the gate
07:30UA 3018 to Newark leaves the gatealso UA 3910
15 h 08 apart on the timetable, overnight
UA 3018 leaves 15 h 08 after AA 4912 arrives on the timetable: more than half a day, so not a connection we count.