AA 4689 then DL 468 at Atlanta
Washington National → Atlanta → New York LaGuardia
Timetable, Atlanta time
19:44AA 4689 from Washington National at the gate
19:30DL 468 to New York LaGuardia leaves the gate
23 h 46 apart on the timetable, overnight
DL 468 leaves 23 h 46 after AA 4689 arrives on the timetable: more than half a day, so not a connection we count.