Many commercial jet aircraft components are produced with lost wax casting using titanium, with subsequent hot isostatic pressing. (HIP.) Source: I am a propulsion design engineer at an large commercial aircraft manufacturer. Also "3D Printing" (we call it additive manufacturing) has been used in the aircraft industry for at least 10 years that I have experience with, although it is typically used for either tooling or test parts. I few a 3D printed titanium exhaust duct on a flight test in 2010, then implemented the same part for production using conventional manufacturing methods. 304 of them in service so far with no issues.