To determine day-to-day average prices, KAYAK takes all rates for on a daily basis just before departure over the last yr for flights from London Heathrow Airport to Austin, removes the highest 0.one% to account for outliers, and then takes the standard of each of the values for on a https://www.diigo.com/item/note/aa9i2/am6h?k=4d2f7e6ebe86d7b3a09323de215d7ae7