To determine month to month typical costs, KAYAK can take all price ranges for on a monthly basis over the past calendar year for spherical-journey flights from London to Atlanta, eliminates the best 0.1% to account for outliers, and afterwards can take the median of all values for every month. https://sites.google.com/view/business-class-to-houston/things-to-know-before-booking-first-class-flights-to-new-york-for-business