AA 5510 then DL 1601 at Atlanta
Washington National → Atlanta → Houston
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:41DL 1601 to Houston leaves the gate
23 h 18 apart on the timetable, overnight
DL 1601 leaves 23 h 18 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.