AA 5510 then BA 226 at Atlanta
Washington National → Atlanta → London
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:15BA 226 to London leaves the gate
22 h 52 apart on the timetable, overnight
BA 226 leaves 22 h 52 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.