I'm under a flight path in Brisbane, yeah those freight flights are surprisingly loud compared to the general traffic. For a lot of the dedicated domestic freight flights where I am (I assume it's similar in Tassie), they tend to use old 737-300s and -400s which sound about as loud to me as a much larger 777-300ER flying over, and louder than modern wide-bodies like the 787-9 and A350. Crazy how far engine technology has come!