Airport system, Airplane class

package AirportPkg;

public class Airplane extends Thread {
    // final state for an airplane
    public enum AirplaneState {
        TakeOff, Land
    }

    private static int autoId = 100;

    private Airport airport;
    private AirplaneState finalState;
    private int flightNo;

    public Airplane(Airport airport) {
        this.airport = airport;
        this.finalState = Utils.getRandomState();

        autoId += 1;
        this.flightNo = Airplane.autoId;

        this.start();
    }

    public AirplaneState getFinalState() {
        return this.finalState;
    }

    public int getFlightNo() {
        return this.flightNo;
    }

    @Override
    public void run() {
        synchronized (this) {
            try {
                // waiting to get permission from airport
                wait();

                int time = this.getTime();
                Utils.printLog("Start", this + " start to " + finalState
                        + " for " + time + "ms");

                // airplane is flying. all others should wait
                Thread.sleep(this.getTime());

                Utils.printLog("End", this + " has finished to " + finalState);

                // notify airport to continue
                synchronized (airport) {
                    this.airport.notify();
                }
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    // get random time for this airplane to land or takeoff
    private int getTime() {
        if (this.finalState == AirplaneState.Land)
            return Utils.getLandingTime();

        if (this.finalState == AirplaneState.TakeOff)
            return Utils.getTakingOffTime();

        return 0;
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return "Airplane #" + this.flightNo;
    }
}