AA 3278 then AA 1533 at Philadelphia
Pittsburgh → Philadelphia → Houston
Timetable, Philadelphia time
07:25AA 3278 from Pittsburgh at the gate
19:26AA 1533 to Houston leaves the gate
12 h 01 apart on the timetable
AA 1533 leaves 12 h 01 after AA 3278 arrives on the timetable: more than half a day, so not a connection we count.