public void changeGate() {

    Flight vol = promptForFlight();


    char ancienTerminal= vol.getGate().charAt(0);

    int ancienGate = vol.getGate().charAt(2);

    /* String company, int flightNumber, String destination,int departureTime, String gate, String status*/


    System.out.print("Terminal (A, B, C): ");

    String terminal = scan.next();

    System.out.print("Gate Number: ");

    int gateNumber = scan.nextInt();


      vol.setGate(terminal + "-" + gateNumber);


      airport.notifyObservers();
      if(vol.getGate().charAt(0)!=ancienTerminal && vol.getGate().charAt(2)!= ancienGate){

      findTerminal(vol).removeFlight(vol);
      findGate(vol).removeFlight(vol);
      }






      switch(terminal) {
          case "A":
            termA.addFlight(vol);


            gatesA[gateNumber - 1].addFlight(vol);


            break;
          case "B":

            termB.addFlight(vol);

            gatesB[gateNumber -1].addFlight(vol);


            break;
          case "C":

            termC.addFlight(vol);


            gatesC[gateNumber - 1].addFlight(vol);





            break;
        }





  }