AIAA Large Eddy Simulation of a realistic film-cooling configuration is performed, consisting of a large plenum feeding a periodic array of short film-cooling holes with length to diameter ratio L/d = 3.5. Film-cooling jets are issued at 35 degrees into the turbulent crossflow boundary layer above the flat surface. Details of the flowfield inside the film-cooling hole as well as above the cooled surface are analyzed. Separation is found inside the hole caused by the sharp turning of the flow exiting the plenum. Vortical structures of inclined jet in a crossflow are observed and compared to that found in normals jets. The effect of crossflow fluid entrainment beneath the jet by the low pressure zone is demonstrated and its connection to the film-cooling effectiveness is discussed. Time-averaged velocity field and turbulence statistics are compared to the available experimental data.