This paper quantitatively evaluates the accuracy of the base of aircraft data (BADA) model by comparing calculated fuel flow and total fuel consumption with flight data recorded by airliners' quick access recorder systems. For future more efficient air transportation system research, it is necessary to derive fuel consumption for an arbitrary flight trajectory with good accuracy. BADA, the European Organization for the Safety of Air Navigation (EUROCONTROL) aircraft performance model is widely used for such purposes, but there is only a small number of papers which discuss its accuracy with actual flight data. The purpose of this paper is to investigate whether the BADA model has sufficient accuracy to deal with the study of air transportation systems. As a result of comparison conducted for a single fleet of twin engine wide-body jet passenger aircraft, calculated fuel flow showed good agreement with the flight data in the cruise phase and it was found that the error between the BADA model and flight data falls within plus or minus 5 [%] for a whole flight.