This extension calculates the number of miles an itinerary will earn under the 2015 MileagePlus program rules. It adds a link to view earnings to all fare search pages, displays earnings on the Review Trip Itinerary page, and displays earnings on the View Current Reservation page. PLEASE NOTE: The fares displayed on the search pages include all taxes and fees, so the mileage earnings displayed will be higher than what you will actually earn in reality. The fare basis and taxes are not broken down on search pages so there is no way to show the real value here. When you arrive at the Review Trip Itinerary page, the base fare and taxes/fees are broken out so the calculation can be made correctly. The same is true on the View Current Reservation page: the values are accurate.