It used to be simple. "Connie" was the call sign for the 121 cargo airline (Kalitta Air) and "Kalitta" was the call sign for the 135 Lears and Falcons (Kalitta Charters). But now the 135 operation (Kalitta Charters) has grown to DC-9s and 727s (Kalitta Charters II). So which company are you asking about?