AA 644 then AA 2516 at Phoenix
Tampa → Phoenix → Pittsburgh
Timetable, Phoenix time
20:50AA 644 from Tampa at the gate
16:49AA 2516 to Pittsburgh leaves the gate
19 h 59 apart on the timetable, overnight
AA 2516 leaves 19 h 59 after AA 644 arrives on the timetable: more than half a day, so not a connection we count.