KJ 248 then AA 4478 at Atlanta
Chicago O'Hare → Atlanta → New York LaGuardia
Timetable, Atlanta time
14:25KJ 248 from Chicago O'Hare at the gate
12:13AA 4478 to New York LaGuardia leaves the gate
21 h 48 apart on the timetable, overnight
AA 4478 leaves 21 h 48 after KJ 248 arrives on the timetable: more than half a day, so not a connection we count.