Abstract. Using numerical simulation the paper investigates the aerodynamics of extended airport complex; according to the classification of existing regulations the complex is related to buildings and structures of high level of responsibility. We present the technique used for numerical simulation and the results obtained by the application of numerical simulation, the results were verified with the results obtained during physical modelling in wind tunnel of architectural type. According to the results of the research the conclusions about the pattern of flow around the building wind flow were made.