Originally Posted by
amarc1701
I have found the site milecalc.com to be fairly accurate. I have used it to calculate complex itineraries and even applied special bonuses and COS bonus. Once I reconcile at the end of my trip against what AA posts it has been accurate to about 3-4 miles which is generally just attributable to a rounding error.
i think one of the problems is AA still uses some old/defunct airports of some cities in calculating mileage. I notice this a lot as AUS-DFW is now 190 miles but AA still uses the 183 that was from the old AUS airport (which is now a shopping center) that was closed about 12 years ago. This is seen in almost all routes out of AUS. I guess someone could go through the entire AA booking system and actually write down how many miles each route is, though one problem is what to do about one stop same flight number flights?