Airframe noise produced by the high-lift devices of an aircraft significantly contributes to noise exposure around airports. The VALIANT project supported by the EC with this in mind is aimed at providing a reliable experimental database as well as to assess numerical and theoretical models predicting far-field levels and directivity. In this context, the proposed paper is about the interaction of a flat-plate wing and a non-lifting airfoil. Aerodynamic and acoustic measurements performed for several configurations (various streamwise and transverse distances, flow speeds and incident turbulence rates) are described. An original analytical model in an overlapping configuration is developed, based on the half-plane Green's function with uniform flow and an iterative scattering procedure. The model is compared with other analytical approaches from the literature and assessed against the measurements.