Not only does an airplane burn off by way of a lot of Electrical power acquiring off the bottom, but they also burn off loads of gasoline when their engines are idling on the ground, so the amount of layovers you've on the vacation to Australia will have an effect https://medium.com/@bestpremiumeconomyflights/how-to-find-the-best-first-class-flight-before-your-next-trip-b2b908e932b6