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The Authorised Weight Limits that can legally be used by an operator or airline are those listed in the AFM and the weight and balance manual. The Authoised (or Certified) weight limits are chosen by the customer/airline and they are referred to as the "purchased weights". An operator may purchase a certified weight below the maximum design weights because many of the airport operating fees is based on the aircraft AFM maximum allowable weight values. An aircraft purchase price is, typically, a function of the certified weight purchased.