Three dimensional Navier-Stokes computation of transonic flows about ONERA-M5 (Office National d'Etudes et d'Recherches Aerospatials-M5) has been carried out using the NAL (National Aerospace Laboratory) parallel vector computer called 'NWT' (Numerical Wind Tunnel). The computational space around ONERA-M5 is decomposed into 14 blocks. The code is parallelized in two methods. The first one is sharing the computation for each block to each Processor Element (PE). The second one is combining the first one and the parallelization in each block. The performance of the parallelization is estimated by measuring the cpu-time for solving the Navier-Stokes equations. Validation of the computational results has also been done.