static void Main(string[] args)
        {
            ATCMediator atc = new ATCMediator();

            IFlight kingfisher = new KingFisher();

            kingfisher.SetAtc(atc);

            IFlight goAir = new GoAir();

            goAir.SetAtc(atc);


            kingfisher.InitiateConversation();
            goAir.InitiateConversation();

            goAir.AskForLanding();

            Console.ReadKey();
        }
 public void SetAtc(ATCMediator atc)
 {
     this._atc = atc;
 }