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Calculating electromagnetic scattering and radar cross-section for electrically large objects such as aircraft presents significant computational challenges. This white paper compares numerical methods for efficient RCS simulation of large space structures: the method of moments (full wave), MoM extrapolation, physical optics, and hybrid techniques. Simulations of a 40 m civil transport aircraft at 0.5-1.0 GHz show that approximate methods achieve accuracy comparable to full-wave solutions while significantly reducing computation time, making high-resolution electromagnetic analysis practical on standard desktop hardware.