To estimate each day common charges, KAYAK requires all rates for every single day ahead of departure during the last year for flights from London Heathrow Airport to Austin, gets rid of the very best 0.one% to account for outliers, and afterwards takes the typical of each of the values https://www.evernote.com/shard/s629/sh/74e7a4a3-d9e0-393f-a28d-e67f61b0f1bd/ofozanjVoBmmkEjGMcCpbtl4WxGVMLOA8-UYqV7-SiMkBg5fhNYvX8X_GQ