UA 3874 then AA 4288 at O'Hare
Chicago → Chicago → Columbus (Ohio)
Timetable, Chicago time
01:21UA 3874 from Chicago at the gate
17:29AA 4288 to Columbus (Ohio) leaves the gate
16 h 08 apart on the timetable
AA 4288 leaves 16 h 08 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.