AA 5510 then DL 36 at Atlanta
Washington National → Atlanta → London
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:30DL 36 to London leaves the gate
23 h 07 apart on the timetable, overnight
DL 36 leaves 23 h 07 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.