The quality of an airplane refers to various performances of the airplane, such as speed, safety and fuel consumption. For civil aviation aircraft, the quality is related to the aircraft model, not the flight number.

Therefore, there is no distinction between good and bad civil aviation aircraft, as long as they are allowed to fly, they are safe.

At the same time, the difference between the old and new planes also affects the ride comfort.

Some newly established airlines are new planes, which may be more comfortable than large airlines like China Eastern Airlines. So it is difficult to evaluate the quality of the plane.