To work out day by day average selling prices, KAYAK takes all selling prices for each day before departure over the past 12 months for flights from London Heathrow Airport to Austin, removes the top 0.1% to account for outliers, after which usually takes the common of the many values https://businessflightstosydneyfromuk.health.blog/2024/07/23/some-insights-about-popular-holiday-packages/