C# operator overload usage example analysis

public class Plane {
   public virtual double TopSpeed() { return 300.0D;}
   public static bool operator>(Plane one, Plane two) {  
     return () > ();
   }
   public static bool operator<(Plane one, Plane two) {  
     return () < ();
   }
  }
  class Jet : Plane {
   public override double TopSpeed() { return 900.0D; }
   public override string ToString() { return "I'm a Jet"; }
  }
   class Airport {
   [STAThread]
   static void Main(string[] args) {
     Plane plane = new Jet();
     ("plane's top speed: {0}",());
     Jet jet = new Jet();
     ("jet's top speed: {0}",());
     ("Plane > Jet = {0}", plane > jet);
     ();
   }
  }