AA 2596 then AA 2230 at Miami
Philadelphia → Miami → Houston
Timetable, Miami time
09:05AA 2596 from Philadelphia at the gate
21:59AA 2230 to Houston leaves the gate
12 h 54 apart on the timetable
AA 2230 leaves 12 h 54 after AA 2596 arrives on the timetable: more than half a day, so not a connection we count.