To calculate daily common charges, KAYAK requires all charges for each day before departure over the past year for flights from London Heathrow Airport to Austin, removes the highest 0.1% to account for outliers, then takes the standard of all the values for every month. These are the airlines KAYAK https://firstclassplanetickettodhaka.blogspot.com/2024/07/how-to-design-your-las-vegas-holiday.html