The corrosion susceptibility of any structure is a function of the interaction between the design of the structure, the materials used, and assembly and maintenance practices. Boeing balances materials selection with structural design and finishes to produce maintainable and cost effective vehicles. Based on over forty years of commercial jet aircraft experience improvements in materials and design elements the corrosion prevention systems used on recent models represents a substantial improvement over that of the older designs. The backbones of the modern finish systems are careful materials selection; enhanced, strategically placed drainage; state of the art surface treatments, primers, coatings, and enamels; faying surface sealants used where experience dictates; judicious application of corrosion inhibiting compounds; and special isolation treatments for CFRP/Aluminum joints. Examples of the interplay between structure design and materials will be presented.