To compute every month ordinary rates, KAYAK will take all costs for each and every month during the last year for flights from London Heathrow Airport to Austin, removes the top 0.one% to account for outliers, and then can take the median of all values for on a monthly basis. https://royalbookmarking.com/story18513033/how-flights-to-atlanta-from-london-can-save-you-time-stress-and-money