This is the mediator guy ;D

mediator-pattern.js

function Plane(planeName) {
	this.planeName = planeName;

	this.isFlying = false;

	this.takeOff = function (track) {
		if (track) {
			if(!isFlying) {
				track = false;
				isFlying = true;
				return;
			}
			console.log('Plane ' + planeName + ' is already flying.');
			return;
		}
		console.log('Selected track is not clear.');

	}

	this.land = function (track) {
		if (track) {
			if(isFlying) {
				track = false;
				isFlying = false;
				return;
			}
			console.log('Plane ' + planeName + ' is already landed.');
			return;
		}
		console.log('Selected track is not clear.');
	}
}

// This is the mediator guy ;D
(function () {
	var track1 = true;
	var track2 = true;

	var plane401 = new Plane(401);
	var plane707 = new Plane(707);
	var plane111 = new Plane(111);
	var plane69 = new Plane(69);

	plane69.takeOff(track1);
	plane111.takeOff(track2);

	track1 = true;

	plane401.takeOff(track1);

	track2 = true;

	plane111.land(track2);

	track1 = true;
	plane69.land(track1);
	track2 = true;
	plane111.takeOff(track2);

})();