The objective of this study is to manufacture aerospace components with diffusion bonding technology. Examples produced with this technology consist of thin-sheet diffusion bonding and massive diffusion bonding. The mechanism of diffusion bonding process was presented with schematic microstructure development. Aerospace parts include titanium tanks and a scaled combustion chamber with bonded steel and copper. The microstructure of bonded region shows no indication of heterogeneous phases at interface. It is shown that the diffusion bonding of aerospace materials was successfully performed to manufacture lightweight aerospace parts.