To estimate each day typical costs, KAYAK requires all charges for every day prior to departure during the last 12 months for flights from London Heathrow Airport to Austin, eliminates the very best 0.1% to account for outliers, and afterwards requires the average of all the values for on a https://www.diigo.com/item/note/aa9i2/am6h?k=4d2f7e6ebe86d7b3a09323de215d7ae7