To Estimate month to month common selling prices, KAYAK usually takes all selling prices for on a monthly basis during the last year for flights from Atlanta to London, gets rid of the top 0.one% to account for outliers, after which you can usually takes the median of all values https://whitemagictravels.co.uk/blog/what-benefits-you-can-enjoy-while-flying-first-class-london-to-sydney/