AA 5963 then AA 1533 at Philadelphia
Harrisburg → Philadelphia → Houston
Timetable, Philadelphia time
07:15AA 5963 from Harrisburg at the gate
19:26AA 1533 to Houston leaves the gate
12 h 11 apart on the timetable
AA 1533 leaves 12 h 11 after AA 5963 arrives on the timetable: more than half a day, so not a connection we count.