UA 2824 then AA 5483 at Philadelphia
San Francisco → Philadelphia → Pittsburgh
Timetable, Philadelphia time
17:15UA 2824 from San Francisco at the gate
14:30AA 5483 to Pittsburgh leaves the gate
21 h 15 apart on the timetable, overnight
AA 5483 leaves 21 h 15 after UA 2824 arrives on the timetable: more than half a day, so not a connection we count.