To compute regular monthly normal rates, KAYAK requires all charges for each month during the last calendar year for spherical-vacation flights from London to Atlanta, gets rid of the highest 0.1% to account for outliers, after which you can normally takes the median of all values for on a monthly https://www.evernote.com/shard/s668/sh/07cc0b25-35f0-0033-9c7f-d1ac7259161e/Dr3EBCOonG36bUsgIS6z1q9TwVoc5qpKruq2cMjIuRDpN6s4hCE840rG-Q