To calculate day-to-day ordinary rates, KAYAK usually takes all rates for every day in advance of departure during the last yr for flights from London Heathrow Airport to Austin, removes the top 0.1% to account for outliers, then requires the normal of every one of the values for each and https://www.evernote.com/shard/s629/sh/976be82d-c38a-005e-ef9d-a7543e4b8a71/mcIMh4cYuilOoh04KrrIWEKQZ849Mk-LQF3IF01UY7UIw7Rf4X03pSRc9w