AA 9975 then G4 4194 at Philadelphia
Harrisburg → Philadelphia → Allentown
Timetable, Philadelphia time
10:20AA 9975 from Harrisburg at the gate
22:27G4 4194 to Allentown leaves the gate
12 h 07 apart on the timetable
G4 4194 leaves 12 h 07 after AA 9975 arrives on the timetable: more than half a day, so not a connection we count.