F9 1004 then AA 1533 at Philadelphia
Atlanta → Philadelphia → Houston
Timetable, Philadelphia time
07:11F9 1004 from Atlanta at the gate
19:26AA 1533 to Houston leaves the gate
12 h 15 apart on the timetable
AA 1533 leaves 12 h 15 after F9 1004 arrives on the timetable: more than half a day, so not a connection we count.