To Compute each day normal rates, KAYAK can take all rates for each day before departure throughout the last 12 months for flights from London Heathrow Airport to Austin, removes the highest 0.1% to account for outliers, after which you can can take the common of all of the values https://businessclasstonewyorkcar.business.blog/2024/09/08/what-should-you-know-before-booking-tickets-for-flights-to-memphis-from-uk/