I put how I had done it in Borja"s question. I joined an airline in an area that I could do already - I contacted them and asked about joining. They had a staff freeze at the time but got in touch some months afterwards and offered me a job. From there after a year I moved into flight operations when a suitable opening came up and havent looked back. Still in aviation 25 years later but different employer now. What I am suggesting is approach a company you would like to work for, see what you are most suited for in the vacancies they have now or coming up. Once you are in then you are in a position to find the area you want to be in and work on achieving it.