I don’t like the term “used” or “preowned” applied to airplanes. Those are standards of the automotive industry, and airplanes and cars have next to nothing in common.
The best way to describe an airplane that isn’t brand new is “existing.” That’s the term typically applied to buildings. They are either new or existing. You don’t buy a used house, for example. You buy a new house or an existing house. And airplanes have almost everything in common with buildings and real estate but very little similarity to cars and other vehicles.
