A method for generating cost-per-braking event values, the method comprising: receiving, with a processor, first aircraft data being data from the aircraft itself and representative of conditions of an aircraft during a first braking event of the aircraft and first external data representative of conditions external to the aircraft during the first braking event; determining, with the processor, based on the first aircraft data and the first external data, a first amount of expected wear on a wheel-and-brake assembly of the aircraft corresponding to the first braking event; generating, with the processor, a first cost value corresponding to the first braking event based on the first amount of expected wear; receiving, with the processor, second aircraft data being data from the aircraft itself and representative of conditions of the aircraft during a second braking event of the aircraft and second external data representative of conditions external to the aircraft during the second braking event; determining, with the processor, based on the second aircraft data and the second external data, a second amount of expected wear on a wheel-and-brake assembly of the aircraft corresponding to the second braking event; and generating, with the processor, a second cost value corresponding to the second braking event based on the second amount of expected wear, wherein the external data is data indicative of: external weather conditions from a weather information provider, taxi time or route of the aircraft, an airport map, the airport runway, the length of the runway, a type of material of the airport runway or a condition of the airport runway. receiving, with a processor, first aircraft data being data from the aircraft itself and representative of conditions of an aircraft during a first braking event of the aircraft and first external data representative of conditions external to the aircraft during the first braking event; determining, with the processor, based on the first aircraft data and the first external data, a first amount of expected wear on a wheel-and-brake assembly of the aircraft corresponding to the first braking event; generating, with the processor, a first cost value corresponding to the first braking event based on the first amount of expected wear; receiving, with the processor, second aircraft data being data from the aircraft itself and representative of conditions of the aircraft during a second braking event of the aircraft and second external data representative of conditions external to the aircraft during the second braking event; determining, with the processor, based on the second aircraft data and the second external data, a second amount of expected wear on a wheel-and-brake assembly of the aircraft corresponding to the second braking event; and generating, with the processor, a second cost value corresponding to the second braking event based on the second amount of expected wear, wherein the external data is data indicative of: external weather conditions from a weather information provider, taxi time or route of the aircraft, an airport map, the airport runway, the length of the runway, a type of material of the airport runway or a condition of the airport runway.