Inviscid and viscous flows over CN-235 cargo aircraft are computed at cruise conditions and at angles of attack ranging from 0 deg to 5 deg using CFD-FASTRAN Navier-Stokes solver. Computations are performed on a Pentium III based PC with a 1Gb memory. Grid sensitivity and verification studies are performed on clean-wing and wing-nacelle configurations to determine the effects of the surface grid density, the size of the computational domain and available numerical schemes. Inviscid and viscous flows with available turbulence models over the full aircraft are computed at a range of incidence angles using multi-block structured grids. Computed aerodynamic forces and moments are also compared with semi-empirical and numerical data available in the literature. It is shown that viscous flow solutions provide valuable aerodynamic data, which may be used in determining and/or altering the aerodynamic characteristics of the aircraft. © 2003 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.