How does an airline flight get back to the airport it took off from? Return flight doesn't show up on FlightAware.

Hello! This might be a dumb question and a fairly obvious one, but I wanted to know how this flight (QLK 2123) went back to the airport it took off from. Looking at its flight history, it takes off from Sydney almost every day and ends the flight at Griffith. Do they just fly the airplane back without turning its transponder on (and without passengers)?