The producers decided that every time you are inside a jet and listening to the engines, you’re actually hearing the engines of a propeller airplane.
One of the nicest examples of this break between media and reality is in the comedy movie, Airplane.  The producers decided that every time you are inside a jet and listening to the engines, you’re actually hearing the engines of a propeller airplane.  They are deliberately poking fun at how absurdly the media typically depict the actual joy, precision, and excellence of flying.