Those are too broad. For aerospace, you could specialize in avionics for passenger jets, or design tools, or entertainment systems, etc...
We are seeing domain specialization at work now, though not many really saw the Deep learning coming so most of those people aren't senior yet (and the ones that did are super successful in their domains; e.g. A friend of mine has done really really well in applying DNN to speech recognition very early). In research, we talk about areas, but even these are not very well defined and people aren't really interchangeable.
We were talking about domains, not technologies. They are very different concepts. Technologies are fungible, domains have people and business experience associated with them.
