AA 5278 then AA 1580 at Houston
Washington National → Houston → Dallas-Fort Worth
Timetable, Houston time
20:20AA 5278 from Washington National at the gate
10:09AA 1580 to Dallas-Fort Worth leaves the gate
13 h 49 apart on the timetable, overnight
AA 1580 leaves 13 h 49 after AA 5278 arrives on the timetable: more than half a day, so not a connection we count.