var FixedWing0_1500 		= 21.25;
var FixedWing1501_2000 		= 32.00;
var FixedWing2001_4000 		= 69.25;
var FixedWing4001_5700		= 111.75;
var FixedWing5701_8000 		= 191.50;
var FixedWing8001_10000 	= 244.75;
var FixedWing10001_15000 	= 372.50;
var FixedWing15001_20000 	= 521.50;
var FixedWing20001_25000 	= 681.25;
var FixedWing25001_40000 	= 904.75;
var FixedWing40001_45000 	= 1011.25;
var FixedWingOver45000 		= 2022.25;

var Helicopter0_1100 		= 21.25;
var Helicopter1101_1500 	= 32.00;
var Helicopter1501_2000 	= 42.50;
var Helicopter2001_4000 	= 69.25;
var Helicopter4001_5700		= 111.75;
var Helicopter5701_8000 	= 191.50;
var Helicopter8001_10000 	= 244.75;
var Helicopter10001_15000 	= 372.50;
var Helicopter15001_20000 	= 521.50;
var Helicopter20001_25000 	= 681.25;
var HelicopterOver25000 	= 904.75;

function calcFixedWing(mctw){

	if(mctw > 0 && mctw <= 1500) {
  		return FixedWing0_1500;
  	}
  	if(mctw > 1500 && mctw <= 2000) {
  		return FixedWing1501_2000;
  	}
  	if(mctw > 2000 && mctw <= 4000) {
  		return FixedWing2001_4000;
  	}
  	if(mctw > 4000 && mctw <= 5700) {
  		return FixedWing4001_5700;
  	}
  	if(mctw > 5700 && mctw <= 8000) {
  		return FixedWing5701_8000;
  	}
  	if(mctw > 8000 && mctw <= 10000) {
  		return FixedWing8001_10000;
  	}
  	if(mctw > 10000 && mctw <= 15000) {
  		return FixedWing10001_15000;
  	}
  	if(mctw > 15000 && mctw <= 20000) {
  		return FixedWing15001_20000;
  	}
  	if(mctw > 20000 && mctw <= 25000) {
  		return FixedWing20001_25000;
  	}
  	if(mctw > 25000 && mctw <= 40000) {
  		return FixedWing25001_40000;
  	}
  	if(mctw > 40000 && mctw <= 45000) {
  		return FixedWing40001_45000;
  	}
  	if(mctw > 45000) {
  		return FixedWingOver45000;
  	}

}

function calcHelicopter(mctw){

	if(mctw > 0 && mctw <= 1100) {
  		return Helicopter0_1100;
  	}
  	if(mctw > 1100 && mctw <= 1500) {
  		return Helicopter1101_1500;
  	}
  	if(mctw > 1500 && mctw <= 2000) {
  		return Helicopter1501_2000;
  	}
  	if(mctw > 2000 && mctw <= 4000) {
  		return Helicopter2001_4000;
  	}
  	if(mctw > 4000 && mctw <= 5700) {
  		return Helicopter4001_5700;
  	}
  	if(mctw > 5700 && mctw <= 8000) {
  		return Helicopter5701_8000;
  	}
  	if(mctw > 8000 && mctw <= 10000) {
  		return Helicopter8001_10000;
  	}
  	if(mctw > 10000 && mctw <= 15000) {
  		return Helicopter10001_15000;
  	}
  	if(mctw > 15000 && mctw <= 20000) {
  		return Helicopter15001_20000;
  	}
  	if(mctw > 20000 && mctw <= 25000) {
  		return Helicopter20001_25000;
  	}
  	if(mctw > 25000) {
  		return HelicopterOver25000;
  	}

}

function calcLanding(){
  
  if(document.getElementById('aircraft').value == "") {
  	alert("Please select an aircraft.");
  	document.getElementById('aircraft').focus();
  	document.getElementById('aircraft').select();
  	return;
  }
  
  if(document.getElementById('mctw_landing').value == "") {
  	alert("Please enter Maximum Certified Takeoff Weight.");
  	document.getElementById('mctw_landing').focus();
  	document.getElementById('mctw_landing').select();
  	return;
  }
  
  var aircraft = document.getElementById('aircraft').value;
  var mctw = parseInt(document.getElementById('mctw_landing').value);
  var landingCharge = 0;
  
  // calculate landing charge
  if(aircraft == "FixedWing") {
  	
  	landingCharge = calcFixedWing(mctw);
  
  } else {			//these are helicopter with set types
  
  	landingCharge = calcHelicopter(mctw);
  
  }
  document.getElementById("landingCharge").style.display = "block";
  document.getElementById('landingCharge').innerHTML = "Your landing charge will be $" + landingCharge + ". ";
}