To work out every month common charges, KAYAK requires all rates for on a monthly basis during the last 12 months for flights from London Heathrow Airport to Austin, eliminates the highest 0.one% to account for outliers, then will take the median of all values for on a monthly basis. https://socialbuzzfeed.com/story3969115/5-essential-elements-for-flights-to-atlanta-from-london